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Well, they sell PSUs .
This one is recommended by many members here (including myself). I tested it with my system, compared to multimeter reading. It's fairly accurate and realistic.
With that system at 4Ghz and an overclocked 480. You are looking at 500W or so. A 650W would truely be fine, but Im saying 750W to allow for ample headroom.
I would take the calculator's recommended wattage, and add 50W to it (even though the recommended wattage takes into account headroom already).
The calculator has option for SLI, too.