Best way to power multiple channels/rooms with an integrated Amp?

Hi, I am hoping for some advise on the best way to buy and ultimately set up a hi quality yet simple system that I can appreciate in two spaces. I currently use a home theatre amp to power my biwired Sonus Fabers. I want to upgrade my Amp but at the same time add a couple good outdoor speakers that I can listen to together or separate from my indoor system (not expecting to play different music in each space FYI). The easiest would be a high quality Amp (Yamaha A-S3000?) with a basic A/B selector and phono input but that would eliminate my ability to biwire to the amp right? There are also speaker switches but how well do those work? Do they impact sound quality? I'm not expecting big things outside but would like to hear my inside system playing my vinyl in top quality and then be able to walk outside(with the door closed) and still listen in decent quality. I also want my family to be comfortable using it without a users manual. 

Thanks in advance