Denon makes a wide range of products, and I personally don't think you can get much better than their best electronics. I do, however, generally think that Yamaha is a better value, especially in the receivers, which is why the last two surround receivers that I have owned have been Yamaha. But if I had encountered an appropriate Denon at a better price, I would have been fine with purchasing Denon instead.
And Denon has long been regarded as a leader in DVD players, though they have always charged a lot for their best, and now the Oppo players seem to be a better value.
I think that Rotel and B&K have made some good products, too, but I think they are almost invariably overpriced (or so it seemed to me, when I last checked, which was prior to the current lineups).
As an aside, I would be very interested in your assessment of an Oppo DV-983H. Given your huge budget for shiny disc players, another $400 would be almost nothing to you, but for me to make a similar comparison would cost a fortune for the Denon DVD-5910CI.