I (like a lot of others here) am seriously leaning towards the new Onkyo 600 for my powerhouse. I have the JBL NSP1 set and am probably getting the sony 40 subwoofer. If I get this deck I'm not sure if I should get a single rear speaker or two. Will having 2 make it sound better or worse? And will this thing even power 2 speakers, like a second set of N24's, or do I have to get 2 4ohm ones and put them in series? If I should only get 1 rear, which one you recommend? Also, is it even worth it to get the 6.1 compared to 5.1. Is the difference that much better, or should I just get 5.1 (perhaps the new Onkyo 500 or the H/K 320) and upgrade to true 7.1 in a few years? I want to keep it at or below the $500 mark. Thanks for any help you can provide, you guys rock!