I agree the single GPU GTX 580 3GB is the best option, and it offers the future upgrade path to SLI with a second 580 later. Once ROF and COD have finalised their SLI patches that is.. DCS A-10C already has some SLI support it seems.
Do you really think more than 1.5GB VRAM is needed though? Looking at MSI afterburner my 1.5gb Vram doesn't max out in COD unless I turn everything high and use > 2560 resolution or multi monitor. (which you can't do anyway due to performance issues).
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