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If money is a bit tight than obviously go for the gtx570 and maybe look to pick up another one in a few months for some nice SLI...but if you've got the cash then the gtx580 is a beast that will let you turn up all the shiny on just about every game out there right now while still keeping very nice frame-rates (with the obvious exception being BF3 with a dual gtx580 setup being the only solution out there that seems to be able to tame Frostbite 2.0).
Although, I think a better question for the community might be gtx560i vs gtx570.