I agree.
For most people, and for anyone who is not doing new construction, it makes more sence to have a couple complete systems and eliminate the wiring between rooms. For most people's secondary HT, a $1K receiver would work great. All you really need in the 2nd HT for sources is a DVD player.
The primary HT can connect to zone 2, 3, etc. and can also output audio to the secondary HT using a single set of analog RCA cables. This way you only need a single 300 disk CD changer, MP3 player, XM radio, etc. and can listen to it in all rooms.
While the Denon 5805 has a lot of features in one package, it doesn't allow for cool touch pads in each room for selecting the music source like a full fledged multizone music system and distribution amplifier would do.