Can anyone suggest a quiet solution for a Micro ATX PSU? I don't want to go to the expense of buying a new case that'll house a standard ATX PSU. HELP!!!

All the Seasonic PSU use their quiet fan controller circuit, so they are quiet. I have 2 samples I haven't had time to fully review; the fans do run very slowly. The main issue is that they are "clickers". The bearings could be better. Fans are 80mm, which means they're easily swapped for a quieter model, if you're into that. Leo, in his article, Ultimate Under..., mentions an AOpen H300A Slim Case that has a very quiet PSU.