piggyback a 2nd PSU off the the 1st (there are 3 or 4 good ways to do this on the net)
buy cheap and quiet, no need for a very expensive PSU for the pelt - it doesn't need the stable voltages that your MB & CPU like
a smaller high quality unit (i like the antec trupower 430 or 380) and a cheap big unit will likely be more affordable, expandable, and less likely to cause issues w/ your MB lilke low voltages
it might be worthwhile to recheck the sources you used to determine the wattage needs of your system - it's fairly difficult to use 400 watts
CPU - max ~100w, GPU - max ~100w, not much else in a system that uses huge amounts of power
also consider that a high quality PSU should be designed to provide 1.5 times rated power for brief periods of time
as far as how large a PSU for the pelt - well that will be determined by what wattage the pelt is designed for - this is a good reason to buy 2 power supplies
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