your right...it's all predictions....anything 6870's CF or 560's SLI should do VERY good...but I hope single card solutions give it a good run as well
Oh and you motivated me to just go ahead and buy that power supply I needed for the 580's 5 minutes ago
That's good... but you're wasting your money. If I were you, I'd wait until Kepler and buy the "GTX 680" ... But in your case, you bought the 580's already - so you should now sell your 560's and try to sell that power supply too.
I'm a high school student so it's hard for me to get an ultimate gaming PC or two video cards in SLI/CrossFireX with a high-end power supply. Currently, I have the Corsair HX750 PSU and I'm not planning on buying another video card since I would have to throw it away or sell it at a cheap price and buy a very 'expensive' one. So I'm planning on buying a Kepler if its price is the same as a GTX 570 right now + the extra money for a 1000W PSU = $400 - but obviously the performance should be higher than a GTX 570 SLI.
Get it? I'm saving money!