Bigmonkey,
Just an alternative - have you looked into Sonos or Logitech Squeezebox and similar devices? If I understand correctly what you want to do, I believe they also offer a good solution to get music to different rooms. They might offer more functionality than what you are looking for, but they will get the job done for sure.

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1