I guess that is an option as well.
Denon 3310CI
ZONE 2 OUT: To amplifier #1 - Powers the speakers which are on the deck (near)
ZONE 3 OUT: To amplifier #2 to volume control
Zone 2 of the Denon 3310 has variable volume control integrated and acts as a true stereo preamp. Heck, if you have only a 5.1 setup in the room, then the extra 2 channels of amplification can be dedicated to your deck speakers if you would like.
Zone 3 of the Denon 3310 is fixed audio line level which can be fed directly into an amplifier then onto the volume control.
The upside of this is that you don't need a speaker selector box at all. The other upside is that you get discrete amplifier power to both zones. The downside, perhaps, is that you may need to get two amplifiers - which isn't a huge price issue considering that you don't need the speaker selector box.
The other big plus, as (kind of) mentioned, is that you could get an RF remote control if you wanted and control the source selection, and the source itself, from outside as you wanted to. Very cool to be able to do that if you want.
I would almost definitely go that route.