Well it's not my money but I would lean towards a 7-channel amplifier and use the 2 amps that aren't being used for the 5.1 for zone 2.

Or are you using some of the extra channel of the Yamaha 9.2 setup for your other zones? It's not clear to me from your email.

I think 125 watts would be enough for a room your size. No experience with the 2200's so I won't comment.