I used to have a GeForce 8600 GT. Never understood why that card didn't get more love than it did, because it was pretty awesome at the time in terms of price/performance/power use. When I replaced it last year, I gave it to my friend, since he was trying to play games on his gimpy old 7300, but he managed to fry it somehow. So much for that idea.
Now I have a Radeon 4770 instead, which I've been pretty happy with. Catalyst Control Center is complete junk compared to the Nvidia Control Panel, but since I rarely have to use it, I'll get over it, because the card itself works well. Nvidia may have pretty good high end stuff at the moment, but the power use and heat output of them is just depressing. I can crank up most games I play to max on this thing even at 1920x1200 without the fan going over ~1400 rpm and the temperature still low, so it doesn't sound like a plane is taking off in my bedroom every time I fire up a game.