I would stay single 570. It's more than enough for your resolution and will still be fine at 1080p. If you feel you have to upgrade now then order an evga gtx 670 that is on sale at memory express for 310( it's on back order, but there is no rush) and sell you 570.
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Desktop: X3 710, 4GB DDR2 1066, MSI Cyclone GTX 460, Seasonic S12II 500W
Away from home light Gamer: Acer Aspire 15.6", A8-3500m, 4GB 1333
Internet/General Use: Lenovo B570 15.6", i3 2330m, 4gb 1066mhz
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