Look at the upcoming Denon models.
Download the app and play with the Demo mode and go to their site for the most in-depth info. It's too bad you didn't ask before the middle of last week- I could have asked the trainer how well this works and we could have demo'd it in this way.
I tired the demo mode from MusicCast but I can not see if I can have two zones running of the same AVR. Also I did not see any specified info about Zone 2 of AVR and how they will work with MusicCast.
If you look at Airplay and UPNP (with Denon AVR) it usually mostly works for the first zone and you would then manually have to switch to Zone 2 which is unintuitive and user unfriendly
The Problem with Denon is that I work in Indonesia where Denon releases their models one year late.
So here the latest models are the 200 series (x1200, x2200 and so on) and they do not sell any heos speakers here because they think their is no market in Indonesia (a country with 250 million people)