Of course if you need two systems, you need two systems, especially if they are in two rooms.
But I was suggesting that (say) and AV amp can be quite as competent at driving a pair of stereo speakers as an expensively labelled "HiFi" amp.
I did say it tongue in cheek, and I think Rob understood that, but only half tongue in cheek. There are AV amps out there that will do the job well and for not a lot of money. The snobbery lies in refusing to accept that.
What about a Yamaha RX-V667? 90w per channel or 180w into a stereo pair if you use bridge mode. A remote control pre-amp and DAC thrown in for £350.
http://uk.yamaha.com/en/products/audio-visual/av-receivers-amps/rx-v667__g/
These could be better
http://www.expertreviews.co.uk/home-cinema/1279507/yamaha-launches-aventage-receivers