I chose plasma about 3 months ago and I love it! The Samsungs are the best Plasmas out there on the market so you won't be upset about the choice.
The biggest difference that I've read about between LCD and plasma is that LCD still suffers from pixellation issues during fast moving action scenes. You can see this to a greater degree when watching motion on standard monitors. Plasma handles that issue like a champ vs LCD. The only thing that you have to worry about with Plasma is burn in. During the first 100 hours of use you should set all the contrast and brightness settings to about 25% since this is when the phosphores burn their brightest (i.e. when it's brand new). After the 100 hours you can beat the heck out of the thing. Also don't leave static images on the screen for extended periods of time (like a paused video game or a TV show with a logo fixed in a corner). When I say extended I mean hours so this shouldn't affect your normal viewing habits. If you need to pause a game or something just switch out of game mode and back to cable or just turn it off.
The bottom line is although it takes a bit more babying in the beginning I think you'll be happier in the long run. The best thing to do is to go to Best Buy and just compare the set you are planning on buying to all of the other Plasmas and LCDs on the wall. Once you get it I'm sure you'll love it.
