GPU for Pentium G630

Hey guys, I was just wondering which GPU should iI get for this processor? I only want one that will let me play games like WoW, Dota 2 etc at 1440x900 on high settings. I don't want to spend much money since I only plan to use this build for a while and then build a new gaming pc from scratch. At the moment I am using Intel HD 2000 intergrated graphics.

So I would like a GPU that won't bottleneck with the processor and will play WoW (and similar) at high settings. I will only be using this pc for about a year and then build a new system. I was thinking maybe the 7750/7770 but i thought maybe a 6670 would do? Please leave your suggestion down below. 

I'd say 7770 is your best bet. It's a better value (performance per dollar) than either the 7750 or the 6670.