Fire and spec for damage only. You don't need stuns or things like that.

Frost for solo mages if far better, but with 4 you 2shot anything so there's no point in being able to kite things. And if you want AoE Blast wave is awesome of course.

Something like this to start with:

http://www.wowhead.com/?talent=oZxgGzfccoeRt