I have LCD, LED LCD, Plasma, mutiple DLPs. It is not a so simple. I just bought the latest 37" Panny LED LCD as a PC desktop display its image quality up close exceeds my 82" DLP by a good margin but the blacks are purplish and if you had an 82" or larger LED LCD you could not afford tun it on.. the power bill alone would be catastophic. I just watched Alice in Wonderland on the Panny LED and even at 3 to four feet it is not an immersive experience. Incredible detail with great out of the box color. Nice set, it has issues though. Panny locked the software down to a rediculous degree, and Panny's tuners and channel management suck. They also create more mpeg noise on decompression of Digital cable than is excusable. I use a Tivo HD and except for the compression champ, my local PBS station, it is a rarely noctice thing. The Panny is macroblocking like crazy from its own tuner. I brought home the competiting LG to compare. Odd there is no comparison, the LG has a the software and the tuner, though it still macroblocks way more than it should, but it can't match the Panasonics panel in image quality. I wanted to so much to prefer the LG.. If I ever was in the market for a big LED, I would look seriously at the LG becasue of Picture Wizard and a thousand other things. But a properly calibrated big DLP withe a Tivo Hd or later still beats LCD in more than just size. Calibration is vital on the Mits.
These little 37" Alpha IPS panels get a very nice tight grain structure and the have almost give that film like expreience that is part of the nature of DLP, with the IPS LED panel capable of much finer detail.
Still I sit 14' feet away from my 82" and that is a home theater presentaion. The supersize Mits is not all that bright but after a lot of loving calibration it is like a good, very, very bright front projetor but without the reuqirement of a bat cave to use it.
Of all the sets I have owned over the years my 82" Mits is my favorite TV by far. If Mits does a 3rd gen 80 or bigger inch laser display, I will probaby be there with my ncikels, a 100" would ideal for me. My only gripe with the 82", it just does not want to make 30 ft lamberts calibrated..
There is no rationale alternatives in the market above 70" unless you can go front projection. Arguing about image qualtiy of an 82" versus a 37" is crazy, think dpi.