Here is the power supply:SILVERSTONE ZEUS ST65ZF 650W
Budget is about $100 for the GPU.
Just looking for swapping the video cards out and maybe the CPU if I can find an AMD FX60 for a decent price.
Just trying to prolong the life of this computer a little bit, with as little as possible.
Just to clarify, 1x ATI 5670 or 1x GTS 450 would be better then the 2x 7800 GT SLi.