The Yamaha is great for Oppo BDP-83 over HDMI (SACD, DVD-A, Blu Rayany other source), but I rarely use that. I usually play back all my sound from PC over analogue 5.1 (Sound Blaster X-Fi Surround 5.1 Pro). Sources vary from MP3 to hi-res FLAC. And for that, the Yamaha fails tremendously. It sounds like a transistor radio.
i agree with what said ProgRules. it doesn't matter what receiver you gonna obtain, you'll get have same problem.
after all PC sound cards (unless card was designed for pro. usage), pretty crappy and directed mainly for gamers,
who's doesn't care about sound and quite happy with optical or coax interface.