This build looks pretty nice IMO

http://www.worldofwarcraft.com/info/classes/bc-mage/talents.html?2300052000000000000000000000000000000000000000535320310235012251051

I'm still unsure of the water elemental though; when I tested it on the ptr I found it didn't last as long as I would have wanted it to and that it doesn't do A LOT more damage.