All I can say is avoid buying AMD trash graphic cards IF you are a true gamer, Nvidia is the best choice for gamers
I bet you won't get disappointed.
stick to Nvidia graphics, they rock your games.
My suggestion to you:
Customer Choice Award Winner :
EVGA 01G-P3-1556-KR GeForce GTX 550 Ti (Fermi) FPB 1GB 192-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card