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As long as we aren't talking SLI, definitely
If they have the Earthwatts 430w, you might even want to go with that to save a few bucks. I have one and my rig is very similar to yours. The 430w will run the 8800gt too.
If they don't have the Earthwatts 430 just grab the Earthwatts 500. It never hurts to have a little bit of extra power in case you decide to upgrade something in the future.