I got my 7900GS for $95. I'm very pleased with it.
Matched up with a low end core-duo (E6300), 2GB DDR2 ram... I get 65-75FPS on AH (Max settings, 1280X1024, 1024 HIRES textures). Before the latest patch I MIGHT drop to 50FPS on rare occasions, but after the new patch I have yet to see it drop below 65 (odd.. my FR actually went UP with the new update!)
FSX I get 25-35FPS at about 3/4 settings (also 1280X1024).
Everything else that's graphics intensive are older programs, and easily fly by at 75FPS at max settings.
I just can't justify the cost of 8800 cards for the two games I run that might actually use it...