NVidia usually has great reliability and usually the drivers are better then the ATI drivers. ATI usually still has crappy drivers wich don't let the card use it's full potential when a new chip comes out. When the new chip is on the market a little longer the drivers are updated and the performance of the card is much better. NVidia's drivers usually work great. I know someone who uses NVidia-drivers on 6 different OS's and with multiple monitors and it usually works fine without problems. The New GeForce chips are very expensive. If you go for the mid-budget speed cards the ATI 8500 is great, as are the GeForce 4 cards. If you go for optimal speed/value for money balance you should check some reviews.

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