There are certainly some very quiet, powerful PSU's to be had. Just tried to find the thread and couldn't but a quick hunt should get you all sorts of ideas.

Replacing the stock ones is nice and easy too.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock