The PSU he picked is very highly efficient (82-88%; 80+ BRONZE certified), has a combined total of 30A on the 12V rails and is very quiet. He's paying a bit more now, but he'll save money on the power bill in the long run, AND he'll get a quieter PC (which was one of his goals).
You don't need the 520W model. 385 is definitely sufficient, though that price is rather steep. Check out the review of that line of PSUs on Anandtech.
You're right, he doesn't need a 500Watt power supply with the rig he listed.
...but if he spends just a little more and gets a stronger supply it might last him a while longer across future build unless he knows he's gonna want a shiny new PSU in the future. Or maybe he'll not upgrade this rig at all for 4 years and won't need any more than the 385, but it doesn't hurt to have more in the bank than you think you'll need, is a 500Watt that much more expensive in terms of noise and money?
Thanks a lot to everybody! I noticed that NewEgg has the 425W version of the same PRO82+ series for $99.99. This one also has additional 6/8Pins connector. Again I am not sure I need this much wattage. The only other possible upgrade I can think of would be blu-ray burner when/if this format becomes ubiquitous and prices fall to reasonable level.
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