I have had the Sonos system for about a year and love it. However, this thread raises a basic question for me. Are the people seeking ZP-80 upgrades using multiple high end systems throughout their homes or is the Sonos functioning as a wireless connection between a "main" system and a remote server.
If people are doing the latter, there's got to be a better (and cheaper) way than modding the power supply, adding a pace car and adding an outboard DAC. If we're talking multiple high end systems, I get it.
Marty
PS - The Sonos was, to me, always about the user interface rather than performance. Therefore, I've largely punted on quality - generally preferring the "push a button-hear your entire library" convenience of the admittedly poor sounding ZP-100. I use ZP-80s in 3 rooms, 2 of which have pretty high quality systems (Bel Canto s300i/CD2/Silverline Sonatina and Pathos Classic One/Digit/SF Cremona). In both cases I'm reluctant to add even an outboard DAC since the functionality of the Sonos remote is further reduced (volume control). When I want quality on these systems, I pop in a CD and bypass the Sonos.