Asus AMD/ATI HD7950-DC2T 3 GB GDDR5 Graphics Card Asus HD7950-DC2T-3GD5
WD 1 TB Black Desktop Internal Hard Drive
Cooler Master Extreme Power Plus 550 Watts PSU
Cooler Master Seidon 120M Cooler
Memory DDR III G.Skill 8gb X 2 16GB Kit F3-12800CL10D-16gbXL 1600 mhz. Rip Jaws
THe thing is Asus Amd/ATI HD 7950 is not available so which is the alternative that I should go for and if I go for the asus gtx 660ti is it a good substitute for the HD 7950????