I just bought a Sony Bravia for myself, and that's a LCD. Basically in Theory Plasma's are better then LCD's for Video, where LCD's are better then Plasma's in Image Quality. First and foremost I say pick up a 1080p Screen because you can see the difference, and watching 1080 in HD is differnt then 780 in HD.
LCD's are noted to having trail lines when dealing with a large amount of motion (Action), where Plasma's don't have any problems. Basically the Plasma's are chemical reactions and therefore they produce a better picture when seeing action, but on average I don't belive any Plasma to date has worked perfectly with no signs of age after 8 years. <--- This informaiton was told to me by a few reviews, and seconds hand sources, but I do belive it!
Basically if you look at an LCD and you can't tell that it's an LCD, Then that's what you should pick up.
My Sony Bravia is an LCD, and it has a 178 (I generally say 180) viewing angle and everyone who looks at it thinks it's a plasma. THe picture quality is great, but at the time I was only picking between a Samsung and a Sony. Watch a college football game in HD, and you'll see the difference.