Since Sonos Ports are not available for the near future (october at the earliest) what has everyone been using to replace these?

Back story, we have a customer that has an Autonomics MMS-1e and has had nothing but problems with it since install (when they first came out) and I went to site the other day and the unit has died (assuming power supply).

He has a basic 6 zone Crestron system and just needs a player for spotify and TuneIn (ability to access music from their computers is a plus). Control would be nice through Crestron but it is a Pyng/Home system so unless it's sonos or autonomics its out of the question.