Tryed your build and the classical one with frost mage for the whole night. I can say that it is very fun, and easy as hell to play, but it is really under the classical one based on ice lance
I kept an overal dps of 265k with your build considering the whole dungeon while i had 300k with the classical one. I'm 864 with enough pieces for swapping onto mastery>crit so i used the right equip :P