Multi room single AMP?

Hi everyone new to forum, so hello..

My situation, I'm looking at getting a 5.1 surround setup for the home theater.

and looking at my options I like the idea of the yamaha RX-V371 receiver or the onkyo TXSR577

then I started thinking, as I am on a budget, can I save buying another receiver and speakers for the lounge room, by using a switch setup inline with the speaker output?

[Audio input]- -[Receiver]- -[switchbox]- -[2Xseperate speakers sets]

so that I can switch from speakers surrounding the couch to speakers in the dinning room.

but I can't find a switchbox that does 2X5 speakers (sub can stay same)

thanks guys.

after doing some more searching, I had searched before, but allas could not find anything.

I found ONKYO TX-SR701 THX 6.1
this has 5.1 and a zone 2 speaker as well.

Is this a good deal, it seems perfect for what I want, only need stereo for my music!

what other options are there?

thanks.