Projectors are good for low resolution, low light, and low cost for a potential big screen.
Unfortunately i don't live in a cave and im usually viewing 1080 content.
Unless you are spending big bucks on an HD projector, you are far better off with a TV.
Depends on what you do, plasma is great for movies and darker environments.
The new LCD LED backlit TV's are now pretty cheap, they are bright and use way less power that plasma and even CCFL LCD's. My LED backlit 42" in the bedroom uses less power than my 26" CCFL LCD, believe it or not.
My advice, avoid projectors.