was looking to maybe upgrade from a 7800GTX. How do the cards scale from here up to the lastest and greatest? Like for example I see the 8600GT for 80 bucks on the egg but SLI would they even beat a single 7800GTX? Should I go 2 cheaper cards in SLI rather than go with an 8800? Im not going all out like last build 2 years ago when I splurged on the then brand new 7800GTX. Im thinking about 200ish this time (maybe 300)