I'm doing the same thing. I haven't found a single site with all the info, but from reading a whole bunch on the AVS forums, here's the conclusions I've come to.
Direct View: This is what you have now. Generally best picture quality. Very limited in size, ~40" being the high end, and very expensive in that range. Also extremely heavy.
Rear projection CRT: Seems to be best bang for the buck right now. Same tech that big screens have been using for years, so it's realiable. Sizes range from 40"-~70". Picture quality has gotten very good lately, with the black levels being the best of all the rear projection formats. The viewing angle on many sets is less than you get on LCD and DLP, but has also gotten quite good. Also, cabinets can be very large, though not as heavy as direct view sets. This is the format I'm going with.
LCD: Same idea as most business PC projectors. There's a transparent LCD screen, and a light is shone through it to project the image on the TV. Prone to a lot of the problems that LCD monitors have: slight motion blur (I can see it, not everyone is bugged by it), black levels and white levels not so hot, potential for dead pixels. One of the major plusses is that the sets are very small. Slightly bigger than a plasma, but a lot smaller than RPCRTs. Cost is definitely higher than CRT.
DLP: This is the newest format, and I'm actually not sure about the inner workings. From what I do know, it involves a spinning color wheel that the light shines through. Since it's new technology, it's prone to problems, and I'm reading a lot of reports of people having to have the guts of their sets completely replaced, and others whose color wheels create a whining noise. Price is also the highest of the RP types. Picutre quality is excellent, though it does tend to have problems with black levels as well. Cabinet size is similar to LCD.
Plasma: This is what rich people buy to show off how cool they are. Overpriced, problematic. Stay away.
As I said, I'm going with a CRT model. Unless space is a consideration, you can get a much bigger set for a lower price. Picture quality on the newer models is better than DLP or LCD, especially with black levels, and the tech is time-tested, so they're less prone to failure. LCD would probably be my next choice, and Sharp's Aquos line looks very nice. The sets are physically much smaller than CRTs, but the price is definitely higher. I would hold off a few years on DLP. It'll get there, but right now, there's still a bunch of kinks to work out. They're making progress each year though.
But don't listen to me. The only way to know is to go look at sets. When I was picking mine, I had about four in mind, but when I looked at them, this one
just grabbed me. Picture quality is a very subjective thing, and since it's your money, and your living room this thing will be sitting in, you'd better look at it first. Definitely do your research before going to stores though. AVS Forum
is a good place to start. Just be wary of the brand wars that go on in there. Once posters have their set, they tend to be extremely loyal to it. There is a lot of good info to be had. Happy hunting!