as someone who has had a variety of both , i have always been a fan of Plasma,i have found the picture quality is just a bit more natural,and i do quite a lot of gaming, however ,
At the moment i have an LED because it suits my personall circumstances, i have a very bright lounge with a window opposite the screen, and it is also very thin so ideal for wall mounting .
There are pluses and minuses to both so i would second bigboss and say go with your own instincts and do some demos.