Fair enough, I can't say you've done anything wrong in getting a 8800GTS How many ATi cards have you had? What problems? I know driver support isn't the best...ok so it's crap, but there's always projects like 'Omega Drivers' to fall back on. I had problems when I swapped my 7600GS out for the X1950XT, but a full windows reinstall (must have been some leftover nvidia files) and some patched drivers sorted everything out and running perfectly now.
I wouldn't dismiss them completely, I have a sneaky suspicion that R600 cards are going to be pretty good