I can only tell you about ice/ice.
Ice Control: Ice Slick good, Frost Bite and Flash Freeze bad.
Ice Assult: Power Boost good, Chilling Embrace not so good.
I really should do something about this signature.
Ice/Ice ftw
I like mind/nrg, but ppl says that nrg sucks :S
It sucks in terms of activation time mainly and so dps is a bit dissappointing.
The secondary effects (and PB ofcourse) like the stuns and KB -when used well- are quite good actually. Bit underestimated secondary, but in all honesty there are better indeed. Also depends with what primary (stack the stuns!) it is combined.
And hitting a nice dominated (and PB'ed) TF makes you feel mighty 
looking at the proposed powerset choices I think this might have something to do with PVP.
/energy:
power bolt,power blast: [censored] damage, necessary for building domination in PVP.
bonesmasher, total focus: only good attacks in this set
power boost: the reason why youd take this powerset, right?
power burst: Youll get it, some day.
Ice/Ice!
Also, don't forget to take Arctic Air, it's a great power. You might run out of endurance faster than you'd want before Stamina, but it's many good things in one toggle with a big radius. 
[ QUOTE ]
I can only tell you about ice/ice.
Ice Control: Ice Slick good, Frost Bite and Flash Freeze bad.
Ice Assult: Power Boost good, Chilling Embrace not so good.
[/ QUOTE ]
lvl 30 ice/ice here, so not quite so experienced-
Flash Freeze quite nice actually
CE - remain open verdict. Praf, would have thought this would stack quite nicely with Arctic Air? (and all the other -recharge/-speed powers)
(Not saying I would be standing next to an AV, or even an EB, with it on of course... im talking for the run of the mill lots of minions etc stuff).
im avin fun with both atm they both lvl 8 but im not ust 2 these types of chars at all im more of a brute and tank person, so can u giv me what skills in both are gd and not worth it also what u think would be better, i want to be more of a controller i love teaming so this build would be very PvE