Quad sli is overkill man, it would be too expensive. Unless you play games as a profession, Í don't suggest anyone to get it, unless you have A LOT of money to burn, even then there would be better things to burn it on. I have read some reviews, and crossfire seems to be way better than SLi, so if you really want a multi card setup, then go crossfire, but if you just want a single card setup, then stick with Nvidia, I would suggest the 8800GT or the 8800GTS, the models with the 512MB memory, not the old ones with the old core, these have the new G92 core.