I have Bose, but not the Lifestyle system. My mains are 501's, center channel is a VCS 10, rears are Bose 100 series (crap) . I have an AR sub that sounds wonderful, and I had a friend who had high end AR towers in his living room. They were awesome. All driven by a Harman Kardon receiver. If you want to upgrade, I wouldn't buy Yamaha. I would buy AR if I had to do it over again. If you want to come by and check it out, you're more than welcome.