My current system is: Onkyo 595 receiver Polk RT25i mains and surrounds Polk CS245i center SVS 20-39CS+/Samson 1000/ART-351 (EQ'd flat, reference level) Overall, I'm pretty happy with the sound, but the highs sound kinda' grating at high levels. I'm noticing that I can get a good deal on the Harman Kardon AVR-525 right now. A 7.1 setup might be problematic in my room, because the only place I could put them is about 2 feet behind me on the wall (whereas my side surrounds are 9 feet away). I guess what I'm asking is this: Would I notice a huge difference in sound, given my current speakers and receiver? How does H/K sound, in general, compared to Onkyo? Would it be worth going from 5.1 to 7.1 surround? Would having rear speakers that close to my listening position be a huge problem? Am I crazy for even considering this? C'mon... someone talk me into or out of this.