ive been under the understanding that plasma is less reliable than LCD, and plasma is better for a Gamer, LCD better for Movies/High speed full HD. they had a 50" plasma there for only $699
Just my opinion, but I don't think plasma is better for gaming. it's not as much of an issue with the newer sets, but plasma tv's have been prone to the dreaded "burn in". And until recently, I believe most plasma sets have been only 720p. They're also way heavier.
On the other hand, plasmas generally have a better contrast ratio, a more 3-dimensional picture, and better viewing angles.
My LCD XBR6 has something like an 80,000:1 contrast ratio, which is excellent, but it's a "dynamic" ratio, which mean it's got to be processed to achieve that number. Native contrast is only like 8,000:1, which really isn't very good, but it's an outstanding tv.
These new Samsung LED (and I think the XBR9's) sets are just ridiculously awesome, like 1.5" thick and they weigh nothing. Pricey as hell, but come this time next year, the same sets will be half the price.