^^^ Your dual 6800s are extremely dated... I wouldnt judge SLI based on them...
As for FPS just get 1 single 8800 and they go through the roof... I average well over a 100 FPS at all times in this game with no issues whatsoever. I cant imagine what dual 8800s will be like down the line.
As for quad core... that is a huge waste of money... Its like shooting a deer with a .50 cal... Go get a E6600 and saved yourself a ton of money down the road for upgrading that... I'd worry mainly about your Motherboard and Graphics card purchase at this time. With both of those you can upgrade everything else later on to match.
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Core 2 Duo 6400 2.13 GHZ
EVGA 640MB 8800 GTS Superclocked
2GB Dual Channel DDR2 (667)
20" LCD Monitor
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