With most new power supplies having 600W or more of power, and many being quite loud, it can be hard to find a PSU for an HTPC or other low powered machines.  Overclockers Online looks at a PSU perfect for low powered, low noise situations.  Take a look at the nMedia Mute Power MP-400.
“Although only a 400W version, it should be fine for a decent low-end to mid-range system. For the higher-end PCs, nMedia offers the more powerful 500W version of the Mute Power. If there is one shortcoming, it would have to be the fact that the MP-400 is not modular. As people always say: caveat emptor.”

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