well, Pretty much none you will need to put a bit more in atleast 300 - 400 but sadly there is none that i know of that will give a good gaming experience.
Bollocks he does. You may need $260-400 for max settings gaming, but a 650 Ti or 7850 is absolutely fine for mid-settings gaming. This would be my specific recommendation, assuming that OP is in America: http://www.newegg.com/Product/Product.aspx?Item=N82E16814102998&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=