Im doing 3 mages atm been frost since the word go, less mana cost, less threat, frosite is retarded, winters chill is retarded, combined with shatter= i can kill any elite 2-3lvls above me before it gets to me. Im doing the RAF thing with 2 buddys 1 pally tank and 1 pally healer. Wisdom and salv and the mage armor that lets you regen 30% of mana regen while casting means less time drinking. Its been crazy fun. With frost your looking at almost a 70% crit chance on every mob. Fire is tempting but frost has done me so right from the start.