I've got an older denon avr s500bt that I've had for ten years or better. I'm not ecstatic with the sound. I'd like to upgrade, and be current with hdmi inputs,at least 5.1, or 5 2, and all the Dolby and other sound modes my current head doesn't have. Also, I'd like to not break the bank. Ill always look on ebay or Craigslist for any suggestions you guys have. I'm looking at the denon avr x2000 and x2300 series now. Anyone have a preference? Sound first, relevance second. And price. Price is important.