Addict: Thanks for the fast reply. I don't wish to be rude, but I may not have been clear. Did you catch that the 460's were SLI'd? I should have added that instead of just the "2 X GTX 460". Will the 570 still give me a better experience than the 460 SLI configuration?
i did not catch that "2x" but shrkbay is correct and here are the benchmark to prove it http://www.anandtech.com/bench/GPU11/188
you can play around with various set ups in it. note that SLI/CF do bring in support/driver/noise/heat issues that most single card solution don't face.
the antec 650w linked above will run the GTX 460 in SLI as would most antec, corsair, xfx, seasonic 650w+ units.
Thank you for the great advice. It sounds like the caveat for GTX 460 in SLI are possible issues with functionality. I'm new at this and building this box on my own so I don't want to set myself up for a lot of headaches right off the bat. If I buy two same brand GTX 460s and put them in a board that supports SLI (Asus P8P67 Pro), am I likely to run into problems?