Im using a quiet power supply from pc power and cooling, sound dampening material (quietpc.com), 2 silentdrive enclosures (quietpc.com), 2 quiet case fans (quietpc.com), and a zalman flower cpu cooler (quietpc.com). The silentdrive enclosures and the cpu cooler made the biggest difference. I know the silentdrive enclosures are useless to you, but consider the cpu cooler. The dynamat wont make much of a difference.

Sean