While slightly irrelevant for general home use at the moment and what you can buy at a good consumer price... only because the screens are JUST coming out in 55" models...
OLED will be the way to go for picture quality as it has the best REAL dynamic contrast range currently available, and it gets that through having real blacks (ie next to no light emitted on a black screen).
We run 2 x OLED (24") Sony's in our commercials finishing suites, and they crap all over the "broadcast spec" Panasonic Plasma's.... in fact I've just been trying to calibrate a Panny BT300
to rec.709 (HD broadcast spec) and its not quite there in the red saturation or brightness. We have around 6 or 7 Panasonic Pro plasma's here, and while they are all quite good and you'd be more than happy with them in the home, they don't quite meet critical requirements... no panel tv's have until OLED's were brought out.
My home 6 year old 42" LG LCD (2D only) will remain on duty until OLED's become more prevalent and the price point drops... then I'll be updating. And 42" seems so small now... whereas back then it seemed to be huge in size.
Be interesting to see what happens with the 4K (UltraHD) thing... very few films are actually finished at 4K, and I expect it will still be sometime before general live broadcast content gets near 4k... it still has to be massively compressed for transmission.
So, most content will still be transmitted at either standard def or HD (720p or 1080p at best) and resized to fill your screen size, except for your special higher-price channels (not sure what the situation is in the US with all your available options..) and its taken well over 10 years since HD was introduced and still very little is available in the way of full HD broadcast out here (except Foxtel HD pay channels).
BTW, just got an email from another online forum discussing some of the latest gear shown at CES (Consumer Electronics Show). Here's some info
about 4k stuff, if your into the tech-geek side of tele pictures...