So the above comments make me think this approach makes some sense. The discounted Denon 3600 or Marantz 6014, while overkill for my garage use, could substitute into my living room system easily should my Yammy 3080 ever go down and need to be sent off for service. They hold many of the capabilities of the 3080 for a fraction of the cost. And to get 9 channels of power in the box from Yammy, I think I would have to step up to a 2080 at least, and I have a 9 channel system in the living room (5.1.4).
This decision is getting tougher and tougher and I have to put a limit on where the dollar return value is. I prefer a cooler running yamaha but the 3600 and 6014 discounts are hard to look away from. And after some soul searching and reading, I just don't think we will really use MusicCast that often (at least between living room and garage anyway).