My satisfaction with the 8800GT has made me lazy in keeping up with card comparisons. I'm also skewed thanks to Apple's insistence on calling my iMac's card a 5670. It performs noticeably slower than my PC's 8800GT, with other system specs being fairly close. (Wolfdale vs i3, 4GB of 1066 vs 1333)

My best advice is to not worry about spending *a little* more than you want in order to get a card you'll *love*.