I currently have the HK AVR 520, and I am thinking of going to the Pioneer Elite VSX 55TXi, would I see a significant sound increase from the HK? I love the HK, but I am looking for something new and 7 channels, and I REALLY LOVE the Pioneer Elite lineup. It's got 25 watts more per channel than the HK, plus it's a Pioneer Elite. Would this be a worth while upgrade? Any help would be greatly appreciated! Thanks!