The LED backlight LCD tv is nice because it's very, very thin. The picture quality is on par with LCD.
Plasma refresh rate isnt as fast as LCD/LED so unless you spend serious $$$ you will see ghosting, forget about gaming on a plasma. Also burn in is still a concern for plasma and you should pray nothing breaks with a plasma because it's going to cost you some coin.
I recently purchased a Samsung LED-LCD tv. the 46" C6500 series from best buy. I love it, the only problem is that the internet@tv feature does not work if you have Verizon FIOS in the NYC metro area.
http://www.bestbuy.com/site/Samsung+...&skuId=9784408