What you don't know will hurt you!

I'm sure Julie would be able to give you more information about the SP2 specifically given her first-hand experience, seeing how she owns an SP2. But I can tell you from a generic audio standpoint that the SP2 is going to be able to give you so much more than your current processor/AVR. I can honestly say that you would expect to experience alot more inner detail and focus, better imaging, tighter bass, more open midrange, wickedly clean highs, less distortion and you also won't be burdened with the video section cross talking with the audio section amoug others. Oh and that background noise you were talking about that is totally non existant in your current set-up, until you employ the SP2, you'll never realize how much quieter it can actually get. I thought the exact same thing as you at one point and said "can it really get much better than this", until I purchased my BP26 preamp I never knew the answer, and by the time I got it home and it uttered it's first word, I had my answer.
If there is any advise I can give you at all from this, it would be "DEFINITELY DO NOT SKIMP ON THE PROCESSOR". I would say in addition to your speakers, it is one of the most important components in the audio chain, It is the controll center of your entire system!
I say go for it................you won't be sorry.................I promise.
Happy Listening
