Huh, that doesn't make sense? 1 evga nvidia 256mb WHAT? I'm assuming you mean the 6800 GT though, and if you are talking about that, then yes I would suggest that since you will be able to get another later when it's time to upgrade and it'll also be cheaper.
The SLI set will be faster than a single 6800GT, but if you go with the 6800GT, and gather some funds later... add another 6800GT to that, and you've got something sick.
yes, i did mean 6800gt...but.. whats better for me...games i play are like..... FAR CRY, HL2, CS, CS:S, CZ, DOOM 3, DOD, sonn to be DOD:S....games like that