Forget about replacing the Sonos. Just add a $599 Synchro-Mesh reclocker and a good $275 BNC S/PDIF cable to it. Here are jitter plots before and after:
http://www.audiocircle.com/index.php?topic=154310.0
20psec of jitter from a Sonos. Never happened before the SM. This beats even the best servers available. They also need the SM to lower the jitter.
Here are some S/PDIF cable jitter measurements:
http://www.audiocircle.com/index.php?topic=154425.0
Steve N.
Empirical Audio