I shall put my vote in for Earth/Emp. Never ever thought i'd get an emp to lvl 50 as i hated my defender so much for being dull to play but i really enjoyed having the controlling to do when noone is polite enough to need healing 
One word of caution though, if your going to go empathy as a secondary to a controller, for god sake try to be a good one. Nothing frustrates me more on teams than that emp troller you invite with fortitude....that never uses it, or has CM when you check their powerlist but your still sitting there mezzed for 30 seconds while you politely ask for it 10 times.
This is why i would always take emp with a fire-and-forget primary like earth or illusion, you can lay your controls down, then get to your buffing and healing. Not saying emp is necessarily the best support secondary, but it has the advantage of working under any cicumstances. By this i mean theres no tohit check and no anchors you need to worry about dying etc. Rad is also great but theres so many people out there who see the swirling green mob as a gigantic target they will hit repeatedly until dead every time.
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay
chucking one up for earth/storm here.. talking from own experience, got 2 trollers played to a high enough lvl to know enough bout em, namely my ill/ff to 50 and my earth/storm to 37. I played all other sets, but none to a sufficient level yet to comment.
Reading the "awesome control" an ill troller has.. I have to disagree. Illusion, yes, it has control. However, this aint the hard control that earth is the master in. The control of illusion can be pretty good, but its tricky to master and is also dependent on how your pets feel most of the time.
Illusion was soloable pretty easy as you had some nice damage and some nice control to keep yourself alive. My earth/storm on the other hand, cant solo at all. Sure, she doesnt die, but the damage she deals is too low to be efficient. However all the mobs in a few yards radius are locked down, unable to fight back. She is as much as a team troller as can be.
Earth/storm got too many AoE goodies to neglect in a team. As pointed out before, almost all powers in earth are AoE, same goes for storm. It has been said before that the ill/rad can cover the leroying blaster and another 2 or 3 mobs.. however, earth/storm can lock the whole room down with ease. Volganic gases on one group: held, earthquake/freezing rain on other mob: theyre flippin so hard, they wont fight back. Stalagmites/stone cages on nother group, theyre effectively held. While you might not have the love of PA to absorb the alpha, I rarely miss PA when I play my earth/storm.
So conclusively, I have to vote for earth/storm being one of, if not the best team support controllers out there. Of course, there is no "best".
"god, how many devs did hami have to sleep with to get ED?"
Total Cat @Stagefright
Controllers I have:-
Level 38 Grav/FF
Level 31 Ill/Kin
Level 25 Mind/Rad
Level 12 Earth/Storm
Based on that experience (and lots of play of other secondaries from my defenders, and trying both Ice and Fire controllers to about level 10 before deleting), I'd say that the best mass controlling (and thus team support) controllers are definitely Mind and Earth, and as for secondaries, they are all good at team support (it's the purpose of the set, after all) - some do this through more control options (Storm, Rad, TA) and some via buffs (Empathy, FF).
As for Illusion, it's not a bad set, but I don't think it's nearly as good for large team support as some of the others.
Personally, I've found my mind/empath to be a totally dedicated team support build. I can heal, I can get dead members up and running again, I can reduce their incomming damage quite drastically (both via control and team buffs) and I can also inflict some quite reasonable damage.
What more does team support need? I think the most telling aspect is only ONE of my powers goes unused for any length of time, Clear Mind, and that's only because 9 times out of 10 it's best applied as a "heal" rather than a buff.
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I think the most telling aspect is only ONE of my powers goes unused for any length of time, Clear Mind, and that's only because 9 times out of 10 it's best applied as a "heal" rather than a buff.
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10 times out of 10 it's best applied as a buff.
SingStar:
"Extremists LOVE to fish to get us annoyed so we break the forum rules."
CRACK68:
"The origin of life wasn't planned either, should all life be declared a bug and wiped out?"
Lionsbane:
"You know me.Ever the realist"
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Personally, I've found my mind/empath to be a totally dedicated team support build. I can heal, I can get dead members up and running again, I can reduce their incomming damage quite drastically (both via control and team buffs) and I can also inflict some quite reasonable damage.
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Ill/Emp and Grav/Emp can team support just as easily whilst controlling. Mind is great, but the lack of soft control can be an issue in a pick up team. Sleeps can be hinky, and immob+disorient or AoE Fear or Decoys are a bit more reliable imo and I know which primary I'd want vs an AV or GM. Grav or Illusion.
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What more does team support need? I think the most telling aspect is only ONE of my powers goes unused for any length of time, Clear Mind, and that's only because 9 times out of 10 it's best applied as a "heal" rather than a buff.
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Yes, because I like all my toggles dropping. Keep you team buffed stops the Mez effect, which is SO much better in the long run. It keeps your team going without a pause when they get Held/Slept/Disorient'd etc... That's like saying something like Regen aura is best used near the end of an AV fight when people are low on health, where it can be used to keep everyone at full health for the entire fight.
Ugh, be pro-active with buffs people, not reactive. It's so much better!
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I think the most telling aspect is only ONE of my powers goes unused for any length of time, Clear Mind, and that's only because 9 times out of 10 it's best applied as a "heal" rather than a buff.
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10 times out of 10 it's best applied as a buff.
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Truer words have never been spoken
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I think the most telling aspect is only ONE of my powers goes unused for any length of time, Clear Mind, and that's only because 9 times out of 10 it's best applied as a "heal" rather than a buff.
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10 times out of 10 it's best applied as a buff.
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Truer words have never been spoken
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Meh it itches, but got to agree with archie there
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I think the most telling aspect is only ONE of my powers goes unused for any length of time, Clear Mind, and that's only because 9 times out of 10 it's best applied as a "heal" rather than a buff.
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10 times out of 10 it's best applied as a buff.
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Word! 
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It really depends on what you mean by 'support'.
If you want a powerset that causes absolute mayhem in the enemy ranks (Deceive, Phantom Army, Spectral Terror) - whilst providing great support (Transfusion, Transference, Fulcrum Shift etc) go for Illusion / Kinetic.
IMHO the most fun controller powerset to play
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I have itchy feet in playing controllers. Nothing is as fun as playing my main, Visionist, (ill/kin) and the ability to do almost any role...
a) healer? Ok very good Melee AOE heal available almost constantly ( with hasten and Siphon speed)
b) buffer? Ok need damage boosts ,i have something called Fulcrum shift that i can unleash while I am in Superior Invisibility form
c) Tank? Phantom army can be up enough of the time in a fight so that you can tank them vs Avs. Remember, they are invulnerable!
d) Controller? ok a pet who draws aggro from the alpha strike, a single target hold, a fear pet, a sapper power vs enemies.
Visionist LVL 50 Ill/kin
Adventurist Lvl 50 BS/Sr Scrapper
Destructionist lvl 48 elm/dark armor Scrapper
63 month Veteran