Hmm..you either want damage output or something else useful which is:
Psionic Mastery, which gives mez protection (via Indomitable Will). and protection against Psi damage which enemies start using a lot in later levels
Earth Mastery does have one nice high damage move (rock throw)
If you're PvEing with not a huge view to doing any PvP, take Fire for damage. You get two blasts and a nice shield as well but they're a little too end heavy to be using a lot in PvP. Mass Hypnosis + Fireball will get you a LOT of damage out in 2 moves. Just make sure you team with a good tanker!
Mind/ is very nice AoE build, and /FF gives a bit safety and even allows you to herd some, so I'd say fire epic for the AoE damage goodness.
Thought I was the only Mind/FF Controller out there! I picked Psionic Mastery, mainly because of Mind over Body and Indomitable Will. To be honest, I never used either of them a whole lot, but did get some good use out of Psychic Tornado. Indomitable Will is only active for a short time and has a long recharge, so it seems to be of limited use, but can be a godsend against mobs like those darn Children. Kids today....
If I was to do it again I'd probably go for Fire Mastery for the greater damage output. To be honest, you've got pretty much everything you need!
________
Gabriel Kane, Lvl 50 Mind/FF Controller
Lucius Kane, Lvl 28 Nec/Dark Mastermind
I got psi epic set for my mind/empath troller and it has been great. Took mental blast (like you said, there was a need for some damage dealing moves), mind over body ( a troller with armour!) and psychic tornado (the nearest you can get to a nova!). I have heard only bad things about indominatable will tho (doesnt seem to last that long)
Just a quick rundown of the powers I've used so far, not really sure if this will be all that useful, since you can always just look up what the powers do and probably come to the same conclusion as someone that's used them. Pretty much a case of "It does exactly what it says on the tin."
All the pools offer some smashing/lethal resistance, which is handy, and I won't talk about to save typing time. =)
Psionic Mastery:
Status protection in Indomitable Will is its favourable power for most controllers, though maybe not FF with Dispersion Bubble offering protection form some status effects.
Mental Blast is it's single target ranged attack, and there's an AoE ranged attack, Psionic Tornado, to go along side it, which does Knockdown (might be knockback though, I don't quiet remember). These attacks are very good against most foes that have a mind, I.E. not robot, or zombie friendly attacks. =/
Fire Mastery:
The most damaging of the four, fireball and fireblast + AoE mezzed mobs for some *evil* containment damage, which seems to do good damage on most foes I've hit with it, but lack in secondary effects, not always a bad thing though.
Consume is good for getting your endurance back if you're in need of some, assuming you're running Force Bubble, or Repulsion Shield when you need the end, you won't be able to have the foes close enough around you to use it though... D'oh.
Stone Mastery:
Stand out power in this set for me is Earth's Embrace, raising your amount of Hit Points for a period time/self heal with a long recharge.
There's also a single target, close range (not melee), quiet damaging, attack in Hurl Boulder, that sometimes does knockback.
There's also an AoE knockback that I've never tried, so can't really comment on, but I'd assume it's handy if you've got a tank on your team, and an aggro magnet other-wise.
Primal mastery:
Power boost is the power to look out for in this set, boost your status attacks duration for five attacks (I believe), or for twelve seconds (roughly) worth. Though with the arsenal that mind is packing in the hold/sleep/fear department, I don't think you'll need this so much, because if there's anything moving it'll soon be still. =P
I'm not sure how end heavy FF is after ED, as I've not teamed with one since then =X, but if it is end heavy conserve power might help a bit - it's a little bit like your own, personal, Recovery Aura - well actually that's pretty much what it is. Heh.
Power blast, a single target, long ranged attack, while dealing good damage, it has a high chance of knock back, which can annoy melee people, but if you pick your target well, no worries there. =)
Um, I'd personally get Fireball and Fireblast from the fire pool. Very good damage right there. Long post just to say that I'd take fire.
I can't really contribute here but is an epic power pool a more powerful set of moves for a set? 
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I can't really contribute here but is an epic power pool a more powerful set of moves for a set?
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Not really. It's more of a "branching out" thing.
Every non-Kheldian AT gets to open up an "ancillary pool" at level 41, of which there are a choice of a few for each AT. That ancillary (or "Epic" pool) has four powers and works much like a power pool, and grants powers related to a single theme that are not exactly the normal sort of thing that AT gets.
So, for example, the scrapper and tanker ancillary/epic pools tend to grant ranged attacks and status effects such as holds, Controller ancillaries tend to grant defense and direct damage, etc. It's a nice way right at the end of the game to flesh out a character that little bit more and make them feel more well-rounded.
Think of them more as a tertiary power set that only opens up at level 41 and you probably have the right idea. So instead of being a Mind/FF controller you might become a Mind/FF/Fire controller, with /Fire being the ancillary pool.
Hi all,
I am rapidly approaching level 41 with the epic power pool soon available. Could anyone suggest any recommendations for which epic power(s) I should take?
I guess something that can really boost my damage output would be off most use to me...
Thanks in advance