So... The gf is going on about wanting a Sonos system... One speaker in the bedroom, one in the living room, one in the kitchen. Now, the question I have is downstairs we already have a Denon 1912 + B&W 685/686 and 608 sub which we stream music to from iPhones/iPads etc as well as movies. How would the sonos play 3 compare to the existing set up? Also, is it possible to add existing amp/speakers system to sonus so we could stream to both the downstairs set up and one upstairs? Thanks!