Well, this old fart finally took the plunge and bought a Panasonic plasma the Viera TX-P42G20.
I did research until I was sick of doing so but have to say I simply could not put up with the falseness of colour of either LED or LCD. I also wanted deep blacks (not deep greys) and a glass front.
Thus far we are extremely impressed by the thing in general. I have turned most 'enhancements' off to start with and look forward to it settling down and being able to calibrate it properly.
There are a couple of criticisms and one is very monior indeed. The minor one is that in rare circumstances I can see a little banding of colours when watching SD but it has to be where the screen is trying to display an artificial colour pallette.
The other is the sound and a far more 'serious' issue. Frankly it's like going back to listening to an early transistor radio under the bedclothes at night. Awful when coming from my Philips CRT with inbuilt subwoofer and 6 speakers! DO NOT buy this, or for that matter any other, flat screen TV without a decent surround sound system.
Although prior to owning it I swore that HD was of little/no use I am, shamefully, now a complete convert. The built in freeview box is superb and makes our Sky + box look rubbish in comparison. I will probably buy an external hard drive to pause live TV and record in much the same way as the Sky + box does at pres. I've not yet connected it up to my network so look forward to that.
All in all, shame faced I know, I have to admit that Panasonic have completely altered my perception of what flat screens can deliver.
One last comment. Until I bought this beast I had never considered extended warranties. My research has indicated that both their life span and reliability are only a fraction of a CRT so I took teh plunge and purchased a full 5 year one. If you want to do the same, only John Lewis and Richer Sounds do NOT rip you off for it...