I'm in the market for a receiver upgrade, and have narrowed down my choice models from 4 brands: Harman Kardon, Denon, Onkyo, and Pioneer. I currently own a Harmon Kardon avr45, and am very happy with it's sound/performance, but it's about 2-3 years old and doesn't have all the inputs I'm needing now (namely switched component video and digital sound inputs). So in one way I'm a bit biased towards HK, but I realize there are other brands out there that may sound just as good or better. I am looking in the $500-$800 price range. Anybody have bad experiences with any of them? Which one has generally better sound engineering in your opinion? Any other brands you would recommend? Thanks.