If HDMI is a requirement, I'd go with the Denon 1920.
While I traded away HDMI, a feature that I don't need at this time, for what I feel was the better build quality of the Yamaha DV-C6770, I think the Denon is a solid choice. The Denon is a single disc player, while the Yamaha plays 5 discs. Basically, the 6770 is the internet sales version of the DVD-C750.
Somebody will probably try to trump me with a Pioneer player. The model number I don't recall. But heck, it's silver, Yuck!!!
And no, although a few may disagree, I don't think you need a separate CD player with a quality DVD player.