This loyalty/bickering/competition about whether ATI or Nvidia are the best is, frankly, a load of old cobblers
Must confess I was guilty of it for a while, I once favoured ATI but that was only cos they were making better cards at that time.
Then I noticed Nvidia upping the ante a bit so looked at what they had to offer.
Last upgrade I done was from ATI 9800 Pro to Nvidia 6800GT 256Mb. I can't see a blind bit of difference in colours, crispness, whatever. What I can see is an increased sharpness, smoothness and altogether more engaging graphics mode in the games I play.
And that's what buying a vid card is about, right? If you want good 2D, go Matrox.
As for this myth that ATI are poor with driver support, yes, they were at one time, about 5 to 7 years ago I think, when they made a serious attempt at cornering the gaming market their early drivers were atrocious and it put a lot of people off. I think Voodoo 3DFX cards were still about at that time.
So, my advice would be, don't be influenced by brand, both manufacturers supply excellent drivers, just look at what the card can do, and it's price.