Another place to check out is
http://www.plasmatvbuyingguide.com/ I've been lusting after the Panasonic plasma models for a while now, but really can't justify the purchase just yet (I have a 27" console CRT TV that works great). 42" would be SWEET, but is really too large for my intended area, so it will likely be a 37" model.
Two of my friends have access (one owns, the other's roommate owns) front projection DLP TVs. In the right conditions (darkened room) they kick-ass, like your own personal cinema. If there is too much ambient light, its not so great.
Another two friends have rear projection TVs, and those look VERY nice even in well lit rooms. However, they are large, bulky things that dominate the room. And I noted some odd drying effects on the eyes when I watched a video game on the displays. But that may just be me.
If you can wait a few years, several manufactures are looking at Organic Light Emitting Diodes (OLED) for large screens. These are supposed to negate the problems of LCDs where pixels go bad and lock on one color (very annoying to see a red dot in the middle of screen), as well as problems with burn in that older plasmas have. Recent patents cover printable OLED displays, so conceivably the dispaly can be as large as the printing apparatus can handle. Think "video wall" from the movie Total Recall.