Squeezebox for me, still plenty of decent ones available on eBay.

I can't think of anything else that would work for me, I can play anything off my own collection or Spotify through them. I had a choice, Slimp3 or Empeg, I remember Rob at the time was saying that there were many OEMs looking to license it so I went with Slimp3 instead. Absolutely excellent all the way through to when Logitech discontinued them