Squeezeboxes are designed to be networked, so how quiet the computer is doesn't really matter (it can be in a completely different room, you just use WiFi or Ethernet to connect them).
Classically, a Mac Mini is a typical choice where someone truly needs a quiet computer, although new it's above your price range.
At your price range, you're looking for a used 3-year-old computer, which is more than adequate for the job of serving the music data to the Squeezebox. You can choose any major operating system (Windows, OS X, or Linux), as the Logitech Media Server works with all of them.
Michael
Classically, a Mac Mini is a typical choice where someone truly needs a quiet computer, although new it's above your price range.
At your price range, you're looking for a used 3-year-old computer, which is more than adequate for the job of serving the music data to the Squeezebox. You can choose any major operating system (Windows, OS X, or Linux), as the Logitech Media Server works with all of them.
Michael