Plasma is the way to go. Far better blacks, so if you are a fan of art film in particular this is very important. Also, the motion is better, so if you are a sports fan there is no comparison even with the new LEDs.
As far as energy consumption goes, a regular light bulb will consume much more energy. I really don't understand the concern with this. They don't use much power compared to most other things in your house. However, yes, most of them are energy star rated. My Panasonic, which is the brand I would recommend, has an energy saver mode. It also shuts itself down after a certain amount of time of inactivity.