Graphic card

[elan]

This is my rig
phenom II X3 720
biostar 790 gx A3+
OCZ reaper 4Gb
Xigmatex 500 watt

Iam going to buy I graphic card. The most important one is have to be price for performance and ATI for surely. Any one help me please.
Thanks before

 

[katanadude]

What is your budget?