Alright, well I have to wade into this discussion because in my opinion anyone saying stay away from the new ATI cards is nuts. I was a pure NVIDA guy until the 9500/9700 series of ATI cards came out. I purchased a 128 meg 9500 pro to replace my aging Geforce 3 card. I like many people have had zero problems with this card in both Open GL and DirectX. I did numerous comparisions and at the time the 9500 pro was the best card for my money. Today I still see the ATI cards (9600 and 9800) being a better value for your money than the equivalent NVIDA cards. Why? Because they give you better performance with AA and AS on than the NVIDA cards and at a lesser price. When NVIDA comes out with a better card I'll buy it, but for now ATI is on top.
For those who are having driver problems I'm more than willing to bet you've done something wrong installing the drivers. Several people I know have come to me with problems when installing RADEON cards. The biggest mistake I found was not completly removing NVIDA drivers before trying to install the RADEON cards. Do you really expect a card to function properly when the computer still has another manufactuers drivers installed? The second problem I've found is that people were using old drivers. Catalyst 3.7 and up are excellent drivers for the entire RADEON family (9000-9800).
As for games, I've yet to install and play a game that didn't run extremely well on my 9500 Pro. Even this card is starting to show its age when compared the top of the line ATI and NVIDA cards, but for the most part I can run 1152X940 at 4X AA and 8X AS with framerates well above acceptable levels (of course it varies with the game).
My big suggestion to anyone is find someone with the card you are considering purchasing (or one similar, ie. 9500 pro comparable to a 9600, and this goes for both NVIDA and ATI). This is the best way to evaluate a card. And well I'm a fan of the new ATI cards, simply choose the ATI or NVIDA card that works best for you. Just don't automatically discount a manufactuer like so many would have you do with ATI.