I am trying to decide between two Yamaha receivers. One is the RX-V596 and the other is RX-V520. I realize that the 596 has more power, but my question is which one should I choose given they will be used 50/50 as far as home theater and music goes. The 520 has all channel stereo and the other one doesn't. Is this is a legitimate concern or am I just being silly? I plan on combing one of these receivers with a Mission speaker set-up. I'm using Mission because I already have a pair of fronts. Any advice or thoughts would really be helpful.