Someone called for a troll ?
bojo, you can be confident that almost any recent graphics cards would be a valid upgrade to 7900GSs for surround gaming ;)
512 MB of onboard video RAM is the norm now, and it's what you need to play comfortably at high resolutions and /or use SLI to its fullest. SLI/Crossfire or X2 cards are not required at all, but they're an option to consider even with modern GPUs, since at such a high res as 3840x1024 performance is noticeably lower than on regular displays, and will be mostly bound to your graphics subsystem's capabilities than any other component. You may need to upgrade your PSU though...
So you can basically go and pick any modern upper-midrange graphics card(s) you like. For an SLI veteran like you though, I'd recommend a GTX260 (prices dropping !), and if you think you need more muscle you can always add in another one later :)
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