I prefer LCD over Plasma and like Nick says Samsung=Perfect
I know earlier this year, I went shopping for a tv and I noticed that in the stores, LCDs seemed much brighter and crisper than Plasma. I ended up buying a beautiful 52" Samsung LED LCD tv and I love it.
I guess it's all about preference. You should go out to a couple of stores and look at the picture qualities between LCD and Plasma and see which type of picture you like best.