I currently have a few of your creations and they are great.
However, I find that the TV / vinyl rig / other sources would be a great add on in order to upgrade the living room audio setup. If you do this you will make something that a lot more people would use as most of my friends have the need for ONE stereo that does everything. Not just stream.
I have two sets of speakers that would love to serve as tv-room stereo and a system for the kids.
PS. until then; Sonos :/