I have an LCD in the den and one in each of three bedrooms (32" in the den, 19" in the three bedrooms).
If I were to buy again for the den, I would have bought a plasma. Plasmas are much brighter, but as others have pointed out, don't last as long. While the light in an LCD fades and will need replacement, it's a lot easier to replace them if something goes wrong. Plasma pixels are lit individually. If one goes out, you have to replace a whole set of pixels, which is a lot more expensive.
With prices dropping so fast, if you buy a plasma now and need to buy one in five years, the prices will likely be more affordable.
On a funny note, my father bought a 50" Pioneer plasma about 5 years or so ago. He spent a LOT of money for it (about $20,000). For some odd reason, he and my mom took it off the wall to adjust something. As they were putting it back up, they dropped the TV. My mom called to tell me about it and I thought someone was dying. I've never seen my dad so upset about something in his life.