Since you informed me of this, i just checked in. Well clearly 8800GT is as 9800GT, the difference is minor, max 5 %. Can you run benchmark on HD3870 DDR4 and 7600GT?
The funny thing for me especialy is that i recently owned a very similar PC - same Gigabyte mobo, same AMD CPU, it was only 9600GT in my case.. So...
UT3, Crysis, F.E.A.R and COH - great choises. Do more!