It is going to be somewhere in the neighborhood of 8 rooms with 2 speakers per room. Mostly I play music sourced through Airport Express (iTunes from my computer), but it will also need radio and DirecTV.

A friend of mine just installed the Russound RNET solution ( http://www.russound.com/rnet.htm ) with seemingly great success -- but the A-BUS system seems like a better design approach ( http://www.russound.com/abus.htm ). I'm having a hard time finding any decent reviews/suggestions on the various vendors/technology available.