I would go for the 670 over the 680 because of the large price difference, and realistically it's not night and day difference. I would guess if you are really after smooth 3d you are going to need sli 670. 1600mhz ram is the way to go unless you get a deal on faster stuff.
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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
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