Hi,i have a similar set up to you same TV,Denon 1920 and a Denon 1906 amp,no blu-ray player but i did have a Tosh EP35 HD-DVD player.In my opinon the difference in picture was minnimal but noticable and even though i output my DVD in 720p the HD player deffo looked cleaner and more solid at 1080p (i know it dosen't fit the Panas screen resolution as well as 720p).. But I must say that the difference in audio was MASSIVE!! dolby Tru-HD output via PCM and through the multi-channel outputs to MY Denon reciver is REALLY JAW DROPPING!!!,