I used to own a 42" Rear Projection Sony HDTV. Now my brother and dad own Sony LCD HDTVs, non rear projection ones. Plus, I have looked at many LCD tvs in many showrooms. One of my best friends has a Panasonic Plasma, which I tried to calibrate, but was very dissappointed.
Hands down, the best TV I have ever seen, and now own, is the Pioneer PDP-5070 50" plasma. It is "only" 720p, but what it lacks in lines of resolution, it more than makes up for in depth of black levels, color saturation/accuracy and viewing angle width (practically 180 degrees). For 2500.00 bucks you can now get the next generation Kuro version, which features pure 0 degrees of light, or pure black for a near infinite contrast ratio. For movie buffs, especially science fiction or noir movies that feature so many dark scenes, it is the best TV ever. For those that insist that you cannot appreciate Blu Ray without a 1080P TV, think again. This Pioneer accepts 1080p signal then converts it to 720p for the best PQ, even better than Cable HD, which is 1080i at best. You would have to sit five feet from the screen to see the difference between 1080p and 720p anyway, and who besides teenagers, sit with their feet one foot from the bottom of the TV.
Mine gets no burn in, when treated properly: I don't play video game on it, or leave CNN on all night long on it. The picture seems to get better with every month of use.
Do yourself a favor and check out Pioneer's plasmas: they won't be making them for long.