I already have leadtrek 7800gtx, I like to play some games, would I be better off getting another 7800gtx and running sli or getting a dx10 card. I do want to upgrade my system, but I dont have that much money. I would ideally like to go 64bit, have sli system and be able to play my games silkly smooth. i currently have a p4 3.0ghz.