I got a 62" Sony 3-panel LCD in the basement and it's ideal for gaming. The biggest gripe I have about plasmas outside of the cost is the weight. Plasma TV's are friggin' HEAVY. Those were a bitch and a half to put into dude's car back when I worked at The Great Indoors. The LCD in my basement, on the other hand...if it weren't so big, I could definitely lift it by myself. So mobility is a big plus if you go the LCD route. Both are nice though, and remember that Black Friday is also coming up pretty soon. ;)
~Rich
I didn't read the other comments, but I do enough tech podcast listening to give you a decent, albeit-you-should-still-research idea:
Find out when it was made. Modern plasmas (aka later generation) are often BETTER than LCDs for response time and definitely on black levels. Black levels on most LCDs leave a lot to be desired in my opinion, and I'm not even very anal.
So, if it's recent - Go for it.