Newbie has a question

Hello all! I just discovered this forum today and have done some searching, exploring, etc. This is an awesome resource! I am going to be building a computer for my room that will be only for Internet and movies. I have a 15" CRT that I was going to use, but then I got to thinking . . . I want bigger! :D

So:

What kind of light source should I use?

Overhead projectors seem popular. I can get one, but the LEDs by luxeon catch my eye. They are mentioned a few times on here, but not much. Keep in mind that this won't be a huge projection, probably no more than 40" or so.