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Naturally. what you need depends on what you want to do. Based on your original comments, you're wanting to be able to play modern games, which means you need a good mid-range card and would benefit from the current upper range.
Just to provide an example, I have an ATI Radeon 9600XT, which is barely mid-range these days, and I can play games like DOOM 3 just fine. My Aquamark score is approximately 33,000, some of which is due to the fact I run an overclocked AMD 3200+ and have a gig of high performance RAM. But, the video card is a lot of it; I run it at stock speeds, and I have not had a serious problem yet. I get a few delays on some games when a ton of activity is on-screen, and I can't play certain games, like DOOM 3, at the highest resolution with all graphics options on without noticeable problems. But, I can still play it on medium to high settings and don't really notice the difference. I probably won't be able to say that about the next generation of games.
The GeForce 6600 is about the equivalent of the 9600XT, if I read the specs and reviews correctly. (I've never used one, so I can't say from personal experience.) The 6600GT, 6800, and Radeon x800 are about the same. From what I've read, the GeForce 6800 Ultra is the current king of consumer video cards.
No matter which chipset you choose, one based on ATI specs or the GeForce line, you could experience problems with some programs, particularly games. The ATI card may run one game better, and the GeForce card would show better peformance on a different game. If you play a lot of different ones, you're simply not going to be able to get the One True graphic solution. In general, ATI based cards are better with DirectX while GeForce is better with OpenGL. If you're having a problem with your GeForce and a game, I suspect it is because the game relies more heavily on DirectX than it does OpenGL.
Sorry that I don't offer any more definitive advice here. I don't have any to give. The state of the technology at the moment is such that no single product can be deemed the winner in all things.
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