ATI doesn't do as well in Doom 3, but thats about it. With everything else, its pretty much all personal preference. With the card you are suggesting and your hardware, you wont be running Doom 3 anyway. As for your friends saying ATI sucks, they are just being fan boys. Benchmarks prove that up until the X800 series, ATI totally slaughtered Nvidia. So really, its up to you whether you pick Nvidia or ATI, especially with older cards. Now when it comes to X800 vs. 6800, thats a different story since there is a major difference in performance between the two cards.