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I got an I7-950 with 24GB RAM, Win7 64bits and an NVIDIA card. That's plenty. If you need more grunt with realtime video display and interface refresh you can get more cards with a SLI bridge so you'll need a SLI certified motherboard. SLI will accelerate your realtime rendering display features. Ideal for first person shoot up games IMHO. But the grunt for processing power is your main CPU and RAM, not the SLI feature. Also keep in mind that a SLI setup needs proper ventilation and spacing, adequate power requirements too.
I have used PS CS5.5, After effects CS5.5. and MAX 2012, all 64bit apps running on the system. Those applications take advantage of the GPU.I haven't had the need for another video card really, even with realtime display using hair/fur modifiers or displacement maps. That usually will bring any graphic system to its knees so it's a good test. PS will speed up with display refresh/zoom , interface refresh,etc... After effects, well it's a no brainer. Any video app needs some breathing space. At the end of the day you'll still need a fairly fast HD access for swap drives and a lot of RAM. Other than that, it's pretty much it.
About $2k for a system like this including 3x1TB. Ball park.
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