duel 22 inch 1600x900 monitors.
ASRock Z77 Extreme4-M
16GB corsair RAM
1TB HDD and 120GB OCZ SSD
Well, in order to feel free of drivers problem, SLI scaling and those issue...it's always recommended to get a single powerful card.
The GTX 570 is superb for that resolution, will almost max out any game out there with that resolution.