I can't say i personally like the selection of speakers, but in all honesty, the prices don't look that out of the ordinary.
Installation of $600 for a pre-wired house might seem a bit steep but if they have to drill holes and all to mount x# of in-ceiling speakers for a whole house, the price is pretty reasonable.
I cannot comment on the multiple receiver concept. I haven't used the second zone capability of my own. In the least, going with RF over IR remotes would be required, or a touch panel system in each room.
So many possibilities could change that price structure.
