I would definately buy a LCD or LED TV. And make sure its 1080p for blu-ray watching and x-box.
Whatever you do don't buy Plasma because they use more than twice as much energy and they burn out after a few years. I have a sony 52" bravia LCD in the bedroom and a 60" sony bravia LCD in the living room and I love both of them. Great picture and awesome with the blu-ray and x-box.