My vote is for the Elementalist Mage.
Considering Evocation and instant AE are trainable this upcoming patch, there is no reason to waste talents up the arcane tree IMO.
Here is a PvP based Elementalist build that I plan on doing, not set in stone, but something I am considering, please give feedback. I wanted to have all the good burst damage abilities (Blastwave, CoC etc) while at the same time putting some points in stuns and snares (Impact, and Frostbite)
Here's a link, check it out, and let me know what you think!
http://www.worldofwarcraft.com/info/...03203102051300