we've had several reviews (e.g. airport express, olive symphony, sonus, squeezebox) and several "big brother" pieces yet to be reviewed (e.g. Transporter, Olive opus). And yet the obvious buying choice still escapes me. Which unit results in the best SOUND? with or without external DAC, optical outputs, etc? with or without regard to price point? Any thoughts? John A. are you ready to jump in on this? thank you all in advance. Rich