I see a lot of you really like Denon DVD-1600, so I decided to introduce a different opinion.
For a short period of time I had both Denon DVD-1600 and Panasonic RP-82 in my system. I can honestly say that there was noting that Denon did better than Pany and it costs twice the money. So if the picture quality is your main concern I would definitely recommend Panasonic.
On the other hand, if you are in Hi-Res music and want the best of both worlds (DVD-a and SACD) and still want good picture performance, looks like that
Yamaha DVD-S2300 is the way to go.
Of course if sound is your main concern and you can live with its picture there is (now relatively inexpensive) Pioneer Elite DV-45A, which I am very happy with.

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My DVD, DVD-a and SACD
CollectionHT:Pioneer Elite DV45A--Outlaw ICBM--Arcam DiVa AVR200--Arcam DiVa P85/3--Arcam Diva P85--Infinity IL30 fronts, C25 centre, OWS-1 surrounds, IL100 sub--Ultralink speaker wire--Outlaw interconnects--Panamax MAX4400 surge suppressor--home made power cables--Pany TH-42PWD8UK