Well, it's four years later and I've upgraded to a new receiver with all the codecs I could want. I've set the Panny to bitstream and let the AV Receiver do the work.
However, the Onkyo receiver I got also has a Qdeo video processor. So, I am wondering if there is a way in the DMP 80 to disable the video processing. It would only make a difference in SD content, since all my hardware supports 24p, but still I'd like to try it and see if the Qdeo in the Onkyo is better than what's in the Panny.
As far as I can tell, this isn't possible, but I thought I'd post here and ask.