Hi, I'm looking to connect a home theater receiver to my Asus D2X sound card on my computer as an upgrade from the Logitech Z-5300 speaker system that I've had for over 8 years, for under $400. I am getting the Polk Audio RM510 speaker system (unless someone thinks another product would be better for $400). I'm looking at the Onkyo TX-SR608 and the Onkyo HT-RC260 for receivers and I'd like to know what the difference is, only in terms of sound quality and build quality? I'm an audiophile and I'm only using the receiver to connect from the sound card into speakers; my LCD monitor in connected by HDMI from a very nice graphics card. I was also looking at the Yamaha RX-V467. If anyone has any suggestions, I'd like to know specifics about advantages and disadvantages of each of these receivers (mainly about sound quality). General statements are good too, I'd just like to know specifics because I know a fair bit about audio equipment and have a very discerning ear. Thanks everyone!