New
#11
As Zahl said, i think the best and cheapest option for you is to get a nvidia 790i sli motherboard. like the
Asus striker II, it uses the 790sli chip but goes further and uses adds ultra to it,which as far as i know allows for faster ddr3 ram. I think getting a sli790 motherboard and 800wat psu would be best, also the striker II is atx form,so it will fit your case( i think all mid towers are atx or m-atx, just make shore of that and get a 790i that is ither m-atx or atx if you prefer. But getting new motherboard,cpu,gfx cards and so on is more fun...but verry xpencive and a waist since all you need is a motherboard and maybe a new psu.