Energy in general, but Torrent form Dark Blast is probably more KB than any single power in the EN set.
A storm/dark could cycle Gale and Torrent I'd imagine fairly well
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
Prepare for lots of soloing 
That bad huh? lol
Storm/Psi is great
Psi Tornado rocks.
Also, you can get around the "lot of soloing" part by volunteering to go on task-forces. People don't dare to kick you out even if you are knockbacking, knockdowning and knockuping every single thing in a Room of Death.
(Mental Joe, my lv 30 storm/psi currently has 6 knockback/down/up powers I think)
[b][color=blue]Coldest War /[color=red]/ Omega Patient[/b]
[url="http://www.the-cow.net/"][color=red]The CoW Network (Blog) /[/url][url="http://www.collegeofwar.com/"][color=blue]/ College of War[/url]
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Storm/Psi is great
Psi Tornado rocks.
Also, you can get around the "lot of soloing" part by volunteering to go on task-forces. People don't dare to kick you out even if you are knockbacking, knockdowning and knockuping every single thing in a Room of Death.
(Mental Joe, my lv 30 storm/psi currently has 6 knockback/down/up powers I think)
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Hmmmm, list of characters I should avoid having on my TF teams please? Dont like the idea of someone saying "Yeah my build annoys teams but you're stuck with me now"
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
I have a load of Stormies and even I hate knockback. There is bad knockback where you are just sending everything flying and then there is good knockback where you are using knockback to work with the team and minimise scatter, or reverse-herd things.
NRG is 'bad' knockback because you can't do any damage without causing it and sonic or dark both have 'good' knockback powers because they are fast recycling cones that let you position stuff.
Sounds like you want storm/nrg so you can go crazy solo with some bad knockback. I can totally appreciate the carnage though, it's very satisfying. You'll probably die a lot though.
Oh yeah, I know there are good stormies (Psygon plays a good storm) and their Knockback I dont like. But if the playstyle would normally get you kicked from a team being on a TF is just going to make 7 people hate you.
/Dark has good controlled knockback and would be my recomendation
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
Trying Storm/Psi. Thanks guys!
I never really liked the knockback in dark I have to say, despite my love of knockback...
If I was making a toon to knockback-juggle the enemy I'd probably go with Forcefield/Nrg. While psychic blast is good, and has two thoroughly satisfying knockback powers (the tornado (which always seems knockdown not knockback) and telekenetic blast) I just love the two single target energy attacks (bolt and blast) and power push.. power push and force bolt should mean you could keep at least 4 mobs on their backs at all times. And the combination of all 4 allows you to position stray mobs quite accuractly assuming you move quick enough to juggle the mob around.
The cones from dark, sonic, and energy I just find a little too disruptive... unless they are used to knock things against walls and into corners... and most times people don't knock them into walls and corners but just all over the place (me included, usually followed by an oops).
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Hmmmm, list of characters I should avoid having on my TF teams please? Dont like the idea of someone saying "Yeah my build annoys teams but you're stuck with me now"
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The fun part about a Storm/Psi with maximal KB/Repel build is that the team will be horrified at it for about 1 mission, then realize that they're being kept alive by it (usually after a teamwipe that happens when the stormie goes afk), and adapt to the fact that KB/KD/KU/Repel is good and shouldn't be shunned from. In a TF environment this is easier to accomplish than in a regular pug-team
The only people who will really hate you are Herding tanks, but I have always hated those, so it balances out.
[b][color=blue]Coldest War /[color=red]/ Omega Patient[/b]
[url="http://www.the-cow.net/"][color=red]The CoW Network (Blog) /[/url][url="http://www.collegeofwar.com/"][color=blue]/ College of War[/url]
KD and KU is good. KB and Repel is very hard to do right. Often messes up me fulcrumming or transfusion/ferencing, or ice storming, or flashfiring, or cindering, or generally playing to the best of my ability.
So no, it's not just herding tanks.
Absolutely not just herding tanks. Anything with placable powers , debuff toggles, targetted AoEs or PBAoEs will not be keen on that sort of play.
Octavian Vanguard
@ohmsEU and @ohms 2
Badging character: Bimble on the Union server, Badgehunter.com and City Info Tracker.
Us Rad defenders hate scatter, those that scatter dont get mutated
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
Those of us who took Dark Miasma won't be too keen, either.
"OK, Tar patch is down, they're feared and the anchor's on the.........
<insert gratuitous KB here>
<mutter, swear, curse> OK, so now they're nowhere near the Tar Patch, only a quarter of the mobs are being debuffed by Darkest Night and since the fear is still active, the scattered mobs aren't going to be coming back into debuff radius any time soon.
<facepalm>
<sigh>
<frantically scramble to try and salvage the situation>"
Once or twice in an evenings play having to scramble like a mad thing to rescue a situation from excess KB can be entertaining as far as such things go.
Every single thrice damned spawn? No thank you.
(as you may guess, I'm NOT a fan of KB)
Warning:
The above post may contain Cynicism, sarcasm and/or pessimism. If you object to the quantities contained, then tough.
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Thrice every single damned spawn? No thank you.
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Fixed 
Again it comes down to responsible use of KB versus KB spamming.
I like the Dark and Sonic KB cones (and Gale) because they're 100%, which makes them very reliable and predictable. You also have plenty of non-KB attacks to use instead if KB is not the right thing to do in your current situation. You have a KB on tap if you need it (because it really is a useful soft control) and every other power will behave nicely, which makes for a very handy tool.
Unfortunately some sets are very hard to use responsibly (Eenrgy, AR) because they have so many KB powers and because they're not 100% chance of KB. Very unpredictable even for the person firing them. But when that happens should he or she wait until another power is recharged, or take the risk that the KB won't proc this time?
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Us Rad defenders hate scatter, those that scatter dont get mutated
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Or go try and use fulcrum on a scattered-all-over-the-zone mob those that scatter dont get sb either
Even Storm can mess itself up with scatter. A tornado can turn a simple 10 second 'dump debuffs, aoe to hell' fight into something that drags on for ages with people dying.
My first Stormie was a hurricane addict, desparately trying to accuracy debuff every living thing into submission but I'm much calmer with it now. If there is another defender/controller around then it's usually enough to snow storm, freezing rain, tentacles and then O2 the tank now and then whilst blasting.
Tornado is definately a solo power or a "The situation is already completely out of control and if I don't use tornado now then people are going to faceplant" power.... or a power to pull round a corner with when you've had too much coffee.
Knockback usually just ruins opportunities for everyone to do AoE damage and slows down the speed you move at. Sometimes I use hurricane and fly over to the other side of the bad guys so that I'm knocking other people's knockback back towards the team and the debuff patches. That's a great use of knockback! 
My Ice/Rad controller gets really excited about KB too.
She's been shelved at level 40 in a several month long sulk caused by over exposure to peace bringers. 
Of coruse if you're an Ice/Storm or Earth/Storm you're laughing. Tornado + Containment + AoE powers that resist KB is carnage!
I love the knockback on Telekinesis blast (Psi) and Telekinesis thrust - purely for comedic reasons.
I remember 6 slotting the former with Knockback enhancements many issues ago in an attempt to see just how far I could repel a minion, and the result was... (In game terms)- about the length of a football pitch!, Oh how I laughed... I spent a while searching them out on the highest rooftops so i could position myself to Mass-hypnosis them into spare ammo then line them up one by one to fling them to the horizon.
Always been a bit disappointed with Psi tornado myself, but its ok for keeping a mob off their feet and organising any kind of offensive.
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Tornado is definately a solo power or a "The situation is already completely out of control and if I don't use tornado now then people are going to faceplant" power.... or a power to pull round a corner with when you've had too much coffee.
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Oh, I use Water Spout (which is basically the same power) with my dark/dark stalker to keep a nasty boss/EB occupied until I have stacked some Touches of Fear (and to get one or two free AS) and I use it solo or in teams when something went terribly wrong to cover my retreat.
My ill/storm troller used his Tornado in a similar way, but I have since specced out of it, because he's a team toon and other powers are needed more.
I don't drink coffee, so I don't corner pull with it, but I guess you are also right on that one.
If it has eyes, you can blind it, if it has blood, you can make it bleed, if it has a mouth, you can make it scream.
If you like teams with lots of knockback, give me a shout (@norton) on a Tuesday evening after 8PM. Me and a few mates have a regular knockback night where anything goes. It may not be the most efficient way of earning XP, but it's the most fun i've had in over 3 years of CoH.
The team at the moment is 3 Energy/Energy blasters and a Storm/energy defender, but we always welcome anyone who doesn't moan about KB and if they bring their own chaos so much the better
We're currently lvl 30ish, but SKs are welcome too.
edit: we're on defiant.
I love KB. I don't know why. I know it annoys the HELL outta folks, but I love the idea of remotely tossing mobs around like ragdolls. I also have a deep rooted love for forcefields.
Which secondary would you recommend for the knockback effect? NRG? Or?