What is the best and most compatible GPU with my AMD Phenom II X4 955 BE
Proc : AMD Phenom II X4 955 BE
PSU : Superflower 500W SF-500P12A
Motherboard : Asus M5A97 EVO 2.0
Current GPU : Gigabyte AMD hd 6670 2gb
RAM : Vgen 2x4Gb PC-10600
Monitor Resolution : 1920x1080px
need some recommendation to upgrade my GPU
thanks before
Proc : AMD Phenom II X4 955 BE
PSU : Superflower 500W SF-500P12A
Motherboard : Asus M5A97 EVO 2.0
Current GPU : Gigabyte AMD hd 6670 2gb
RAM : Vgen 2x4Gb PC-10600
Monitor Resolution : 1920x1080px
need some recommendation to upgrade my GPU
thanks before