If you can control the light in the room, i.e have it darker without bright lights, Plasma will be the way to go. Conversely, in a very bright room, you will have better results with LCD.
If you get a Plasma, definitely go through the break in period as mentioned earlier. There are disagreements if it is still needed, but after spending that much money on Plasma, I felt I could spend the time to go through the break in period.
If you watch a lot of sports and action, plasma will be the way to go. Plasma also gives you much better blacks on the screen.
If you need, spend a bunch of time over on the AVS forums. A wealth of info over there.