arthurwatt,
First off, I can not comment on either Phillips DVD 963 SA, the Denon 1920 or the Panasonic S49 so this may or may not be of any help.
What I can do is tell you that I have a Panny 32PD50 which I have been using in conjunction with a Denon 2900 via s-vid interlaced and then using the TV's 75/833i (for most viewing). Result is an excellent picture.
I have also used the 2900 using component progressive. Again with excellent results. I would also say that the difference between the two above bearing in mind the TV size and my seating distance is minimal. All this I know you are not that interested in I know.
The bit that may be of interest for you is that I have recently bought a Pioneer 575 which I have been testing on using the same cables and set-up as stated above and I have to say that I am very happy with the results. The picture again is excellent.
What you have to remember though is the price difference between the two units here, say some £500. The picture from the 575 is superb, however the picture from the 2900 is better. But I can honestly say I can not see £500 worth of better.
As a comparison the 2900 has a softer more 3D quality to it the gives it a more cinematic feel, the 575 has a sharp image which has great detail but is somehow 'flatter' (can't really describe it sorry).
The biggest difference between the two units (although the sound from both differ's) is the build quality. The 2900 has a sturdy metal tank like build, the 575 has a naff plasticy feel which can also be slightly noisy in comparison when in use. In this respect you get what you pay for.
Also done some testing with a Panny DVDS27 though scart connection but as it was Prog Scan info you were after will skip that and get to the point.
In short the £100 I have just spent on the 575 was a steal, this works really well with my set-up and though I favour the 2900 (only just) I can honestly recommend that you put this at the top of audition list and give it serious consideration before your purchase.
575 Still in use at the moment as it is my new toy.
Can put the extra £100 you have budgeted for towards a high-def unit when they eventually appear

.
Hope this is of use.
eatstatic.