There are a lot of people that don't know the difference between a plasma TV and an LCD TV and are not sure which one to buy. Neither did I. Recent information seems to be saying that if you want a TV over 42' in size you get a Plasma because that will give you the best picture. Anything under that size, go for an LCD.
The other thing to look at is the resolution. The highest standard is 1080p and thats what you want.
Here is Dotto explaining your HDTV options
More info here: Plasma vs. LCD
