I went from a DSP-E800 (using arcam alpha 8 integrated amp) to my current Denon 3805 (alpha 8 still connected to fr preouts). I can't remember exactly all the new features I have gained but to summarise; the Denon has a lot more power, better decoding inc. DPL2, video functionality (component inputs), better calibration etc. Overall the sound from my Denon is a big enough improvement on it's own. The Yamaha is a cracking machine but I don't think I could give the Denon up now! I still maintain the Yam is a bargain and still ideal for those folks with a decent stereo setup looking to add 3.1 to it for movies.