Steel cases are your best bet for quietness (well, some heavy plastic cases are better still, but that's nothing you'd want). That is to say, HEAVY steel cases. Thick material dampens noise better. Weighty material has a lower resonant frequency.
You should read my Thermaltake XaserV 7000A review at Sysopt. And consider your options in the 1.0mm steel cases.
As for power supply, I'd recommend the Fortron Source/Sparkle Power FSP-530 units.
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