A new ultra-quiet power-supply was just released at PCSilent.de.
It is a Fortron Source 300 watts model modified with a decoupled VERAX-fan. This fan uses a new technology which results in a better air-flow and less turbulences. The fan itself is thermo-controlled which ensures a low-noise-level. The noise-level of the power-supply was measured with 21db(A) which is a really low-level!