What projector / display size should we use?

Alright everyone, time to help out!  We need to decide on which projector we want and how big our table-top display should be.  If you haven't already checked it out, take a look at these diagrams to understand how our multitouch display will work.  The only change I would make to those designs would be to use an ultra short throw projector pointing straight up instead of a projector and a mirror.  Rather than commenting on this post, head over to the multitouch forum topic and give your input!


Edit: The previous forum didn't allow guest posts, so I switched to a different host: http://mumultitouch.forum-motion.net/hardware-f2/help-decide-what-projector-screen-size-we-want-t1.htm.  Click on the link to give your input!