Nah, go ATI. My last nVidia was the 8800GT, and since then its been all ATI for me. I was sick of crashes, not being able to use dx9(!) in rFactor and the damned control panel not remembering override settings. With ATI I have had no issues that I can think of. I now have a 5870 and its a really great gpu.
The only thing I miss is nVidias dual monitor setup thingy.
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