I have enough for one of these cards but i don't know which one i should get. I am trying to build a bf3 ready PC i will be Sli/Crossfiring which ever one i get in the future i wanna know if its better to go with the 580 or is it a waste of an extra 150$ Per card.
Well, we don't know your resolution. Hard to say if its a waste but at 1080p you likely won't notice much difference. The nVidia card is faster, but for me its not $150 faster. If you are building a monster rig and you want to brag to everyone about how many frames per second your getting, than maybe vanity is worth $150.