The pioneer is the best screen I have ever seen, IMHO contrast is much morte important than HDMI, with HDMI you get better refinement at the expense of contrast, which looks cool close up in a shop, and less cool several feet away in your home. Make sure whatever player you get has PAL / NTSC prog. scan, the 25/2550 is a decent player, but I'd personally put something better on a P6, can you stretch to an Arcam DV88 / 89?
Out of your list, I'd avoid sony for reliabiliy reasons, then use Denon for compatibility, the harman for picture quality, but would urge you to spend a bit more on the source, considering you have ther best screen on the market...