SLi enabled and a simple Wolfsdale 8600 Processor and 6 Gb of RAM on Windows 7. It mows down a lot of modern games pretty easily. WoW will run smoothly maxed out on the 8800GTs. If you want to go a little bit modern, I hear the GTX 480 is really, really well made, but they are a bit pricey. If you're an AMD guy, go with a ATI 5650 HD. Though it's possible that in order to get the most out of your 5650, you'll have to spend a some extra money upgrading your system.