FireBall Sorc

36fb/36 mastery does 1.7k damage
and with 36 blizzard/mastery 1.4k damage and severely low cold resist because of piercing mastery you have a bad ass sorc

you can have a timered spell like blizzard keep enemies from getting to close, and a spell to attack them with offensively and main support spells cold shield/tele/energy shield/warmth, and then average level meteor/blaze/fw to work with