I currently have an HDTV (TOshiba), but due to the size constraints of my entertainment center I could only get a CRT (which will have the best picture quality - but at the sacrifice of size and weight)
The plasmas (pixels) will deteriorate faster than LCD, and the LCD has issues with it's grayscale/black level for color reproduction (not that big a deal though).
The DLP's are a very good "in-between" solution, you can get great pic quality with a smaller than CRT foot print and not nearly as expensive as the plasmas and LCD's.
Someone mentioned a floor sample that they purchased - it is advisable to NEVER purchase a floor sample TV because of the amount of time the TV is left on - think about how long you watch TV and subsequently how long the picture tube or projector or pixels (whatever the case) will last - I'd say on average about 3-4 hours per day. Now picture a floor model TV, that's turned on 8-12 hours per day - you just cut the life expectancy of that TV in half or worse.
One other thing to look for is the flexibility of the Remote Control (learning remoes are always best - learning is different than universal in that universal can do 80-90% of the functions of ALL other remotes, learning remotes should be able to learn 100% of all functions of all of your remotes)
Finally, make sure the TV is equipped with enough inputs for your needs - any gaming consoles, home theater setups etc. Component Video is best for pic quality and you should have at least 2 inputs, S-Video is next and then composite. DVI is nice, but no standard has been reached yet, so it may just be hype.
Good Luck!