Projectors?

I'm looking to build a home theater.Thinking of going with a projector for the screen size and money advantages.I know really nothing about them though.I would like something that can play dvd's,video games and the ocational tv show via sat. reciever when my wife is getting her hsn groove on.Is this possible to run these things through a projector?I don't want to spend a gr8 deal of money on the projector..3 to 8 hundred.Used or demo are fine.Any sugjestions would be gr8..thanks