It is a typical concern to have, but if you go to the movies and are happy there, it is relatively easy to recreate BETTER video at home with digital projection.
Point 1: Get a projector designed for HOME THEATER use, not a business projector. (see
www.projectorcentral.com)
Point 2: Plasmas can work with lights on, but projectors (front) demand the lights off for the best quality. See your white wall? That is the color of BLACK with a front projector! So, you need a dark room. Some compromise can be made there - at the cost of quality.
Point 3: Front projectors don't require a huge heavy case, mirrors, or crazy optics to make things work. But, they do require a audio setup. Since, many people are doing audio already, the cost savings can be significant, or at least compatible to a plasma or nice rear projection unit.
Point 4: Anything other than front projection at 80+ inches is just 'big tv'. The only way to achieve home theater is with front projection.