I'm not sure who suggestioned a 650ti.
With the budget, either option of the 3470 CPU, or the 3570K/MB, would allow for at least a 7850, or a 7870 XT. Both those cards are pretty nice, and can kick the crap out of a 460.
Yes, WoW depends heavily on CPU, but it doesn't ignore the GPU, and having a nice GPU -will- make part of the difference.