I would think that using the Barix at a remote for voice-only would yield perfectly acceptable results regardless of what the STL is using for transport. On related topic - if the station is using a compressed format for music storage (mp3, mpeg2, etc), then the multiple pass encoding issue must be taken into consideration. A college station I take care of rips their library tracks in mp3 at 320kbps. On-air, the music sounds fine (well, it sounds fine to them) - but their streaming server runs WinDohs Media Encoder at 128kbps: the music on that stream sounds pretty awful IMO.
I too am waiting for the Exstreamer 1000. The app I have in-mind for it is a weekly, 6-hr, radio show that currently uses ISDN to reach several of its affiliates. The closures on the 1000 would make it an excellent replacement for that show. The savings in ISDN charges would yield a darn quick ROI there.
-D