At work we have a pretty heavy game/demo pc (Athlon64, 1 gig of ram, two harddisks, geforce 6800GT, lots of coolers and lights), all running on an Aopen 300W PSU, without so much as a hickup. The cooler isn't overly hot, and the voltage levels are very close to what they should be.
400W may be a better choice for future developments, but it's not essential.
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