Hi,
I recently bought a DV-600 (my Denon 1920 collapses in a heap half-way through any movie!) - and I have a Panny TH-37PV500. In most cases, I find (as I did with the Denon) that 720p gives the best picture.
Probably has something to do with the fact that the 37" Panny's native resolution is 1024 x 720 - so the panel only has to scale in the horizontal. I've tried outputting 576p and let the panel do the scaling in both directions - but the Denon and Pio scalers appear to do a better job.
At the end of the day, it's down to what you visually prefer...
As a bonus, the DV-600 delivers DVD-Audio and SACD digitally over HDMI (1.2a) - you can lose those 6 phono leads for multichannel audio, if you have a compatible amp/receiver (the Onkyo 805 is my next purchase

). Only one cable to the panel - brilliant!
HTH
