Are these the computers you currently have? or something you are planning to buy for this? If the later one, then I would definitely change lots of things. But yes, your build would win, altho I think it's far from optimum.
dude, an intel core 2 and 4GB of DDR2 RAM??? you have a good chance of winning, but one of those two components could spoil your win... I'd say you have a 90% chance... but you stand to lose a lot more here, a 680 vs a pair of 5770s... though I think metro on the highest settings will simply kill the 5770s