you should get a a10-5800khttp://www.tomshardware.com/reviews/a10-5800k-a8-5600k-a6-5400k,3224-16.html
the 5600k is damn close in performance so you might perfer that.
just keep in mind that the gpu and cpu both use the same memory so get ddr3 1866(company recomended) or better. there is a 25% performance difference in some games between 1333MHz and 1866MHz. and dont skimp and get 4gb its not enough you need 8GB for this.