Would I be better off going x2 8800GT in SLI (on the EVGA 680i Mobo, 16x/16x) or just getting the 8800GTX. I've heard the GT is up to par with the GTX (I would be overclocking either card) but that SLI isn't very good.
A single 8800GT will perform almost to the level of a GTX, so GT's in SLI will crush the GTX. However, do you really need that performance? I would suggest getting one 8800GT right now, and then upgrading when you actually need the power.