Post by Nensho
Yeah frost all the way as you will be using blizzard a LOT.http://www.wowhead.com/?talent#oZZhfzskcuh
Go with that build working up to level 34 for imp.CoC and Cold Snap, anything after that will be spending points how you please, but that build, like Renegadeloser said, will allow your blizzard waves to shatter crit against the mobs that get frost bitten.
Also I have put ice floes and and improved cone of cold in there, so every now and then you can do a quick ice nova + cone of cold for a nice aoe crit on all the mobs, which is much more mana efficient then chaining blizzard, and does nice damage.
Feel free to mix a few points around, just make sure you keep the core shatter/frostbite synergy talents, and at least 1 level in imp. cone of cold and imp. blizzard, for the nice damage buff and the chill effect respectively.
Not sure wether the extra radius on CoC and frost nova are worth it, as your tank will have kept the mobs prety close together.
But yeah, it's a pretty simple play style, Blizzard, frost nova, cone of cold. - Icy Veins for when you want to burn mana on big packs by speeding up blizzard channeling, also after burning a frost nova/cone of cold combo use cold snap to instantly hit them again with it, gotta be worth the talent point.
(Consider glyphing mana gem and stacking up on mana potions to minimise downtime)