Get the 660 ti. It slightly cheaper than the 7950 and with the new drivers from NVIDIA, beats the 7950 in most games at 1080p.
http://techreport.com/review/23981/radeon-hd-7950-vs-geforce-gtx-660-ti-revisited
http://techreport.com/review/23981/radeon-hd-7950-vs-geforce-gtx-660-ti-revisited