I traded up from the Denon 1909 to the 3312 about 4 months ago (when they were very scarce). I really disliked the 1909, so was keen to avoid another Denon, but the extra power from the 3312 made all the difference. There's more supply now, so prices are lower. I compared it against the Pioneer SCLX73 (older model of the 75). The Pioneer was better for movies, but I really rated the Denon for music - the Pioneer just sounded weak and thin in Stereo mode. (I've got B&W 685 theatre pack, and an age-old Jamo sub).
have a listen to them in demo to see the difference. If you search this site, I posted my views when I initially demo'd.