The Panasonic panels are about the only ones that when showing absolute black are pretty damned close, nearly all the others still look grey, however the new Pioneers are getting better, now black is what gives an image a solid and lifelike feel and gives the image real depth. The Fuji uses the Panasonic panel and its own processing to squeeze a bit more out of it. However if you use an external scaler and totally bypass the internal processing on the panel this should in theory make the processing irrelevent, however there are still other things that can improve an image, it may just be one screen has a better power supply?
Either of those screens will give you stunning results, and when using a decent scaler to deinterlace and send the picture back to the screen at its native reolution of 1366x768 it will look very, very good.
The TV units also use the same generation of glass as the monitors, but when you start adding loads of stuff like tv tuner and speakers etc. there is more in there to reduce ultimate image quality. Just compare a Pioneer 435xde with the monitor only version, both the same panel but one has a tuner etc. and the difference is not subtle, the panel blows it away.
If you really want the ultimate that is available at the moment then I would go with either of these two, it may be worth just buying a scart input board for now though and using that till the new scalers arrive, the next generation is about to arrive and they look very, very exciting. The new Lumagen has a few really nice touches and so does the Crystalio II, I don't think either would dissapoint, and they are both geared up to really squeeze every last drop of detail out of hi-def sources.
That is a nice budget to have to play with, spend some time and get it right, there are a few guys on here who can show you their set ups, myself included, so it may be worth having a bit of a drive round and seeing these things up and running.
I would also agree, save some money to get it properly calibrated, on a top end set up it is well worth it, even on a budget set up it is worth it, but when spending £5k+ there are no excuses!