Hoping someone can help me. I want to set up 4 zone stereo and here is what I have to work with. 2 pairs of bose 301 and 2 pairs of Bose 151 outdoor speakers. I also have a Niles SVC-4 speaker selector w/ separate volume control unit. I'm only looking to have low volume background music with decent sound quality. Can you please suggest what kind of receiver I should get that would have enough power to suit my needs without breaking the bank. Or, at least could you tell me the minimum watts ratings I need to be able to run these speakers? Thanks in advance for any suggestions you can offer!