DLP is the cheap alternative to CRT projection. I wouldn't consider a rear projection unit because of the poor visibility when off center. Front projection units are cheap enough and high enough quality to consider... and they're fucking impressive devices. Of course, as long as you have a room that can be completely sealed off from light... and enough wall space for the screen. And enough distance from the projector...
http://www.hometheatermag.com/frontprojectors/