You might also try reading up at
http://www.tomshardware.com. They can be biased sometimes, but hey: we can read test results, right? You can also get to reviews at
http://www.anandtech.com.
I'm with crashoverride: the recent GeForce cards are much louder than most people want to deal with. To me, that's just not a good design, and the ATI cards are just as powerful, albeit in a different way.