Giving soul consumption to controllers is a strange move, especially when they already have plenty of options for healing and end recovery. If you were to pair this with Soul Absorption from Dark Affinity, it seems like a strange move. It would be better to give them a ranged aoe attack instead.
on Dominators though, this is a great selection. To the point id be stuck with which powers not to take!
Ice Mastery for Def & corr, why include build up? Flash Freeze? No, how about Ice Slick? or Frozen Aura?
Spirit Drain? ABSOLUTELY NOT! This is an awful idea! Leave Soul Drain alone!!!