BadassBob
Digitally rendered
A Celeron G530 should be plenty good enough for a music server. Hell, Ive run them off of Atoms (330 and D510) in the past without a hitch. Those 2 particular ones were about equal to a Tualatin PIII 1GHz. The only part where you will want CPU horsepower is encoding a rip. Both of my Atoms took ~7 minutes to encode a complete album to FLAC.