My 6870 is struggling at 1920x1200 and I want moar juice. I'm looking at the 580 GTX, probably the MSI variety with the Twin Frozr cooler so I can have cool, quiet and overclockable card. Are there any meaningful alternatives I've not considered? I've looked at two 560 GTXs, again the MSI kind, in SLI, but my PSU is only 650W and I would probably need to upgrade to a Corsair 750W modular. I'm on the verge of buying so if you have any other suggestions, speak now!