The Sonos has a high level of jitter on the S/PDIF output. In light of that, you will probably want to select a dac that handles jitter well, whether through ASRC, reclocking, or whatever. Another option is to lower the Sonos' jitter by getting Cullen to mod it, as others have suggested.
Either way, I would consider minimizing the effects of jitter an important consideration in your decision.
Bryon
Either way, I would consider minimizing the effects of jitter an important consideration in your decision.
Bryon