If it is music only, go for SlimDevices piece (Squeezebox or Transporter).

If you want for both music+movies, go for Toshiba HD-DVD player and Slim Device/Squeezebox.

I would NOT recommend 800 at this stage. If you read reviews here for music, 800 is on par with squeezebox. I don't think it offers good value for $$ today.

Cheers,
Kishore