I'm thinking of going with a Geforce 770 gtx, but I have no idea on these newer cards in terms of how loud the fan is, or if it needs a really huge power source, or whatever. In terms of making the best machine for gaming purposes, ie anything and everything that's out now and will come out, is the 770 in the field of good price range, meaning I can SLI it up if I want, and able to run on a 700-800W reliable power source? Also, which cards kill your eardrums. It's not worth it if I can't stand the noise...