I use the Smoothboard wii do it yourself interactive whiteboard. We made it as a class project and I love it. It is portable so I can move it from classroom to classroom and it is almost as good as the SmartBoard that I have in my morning classroom. I would suggest that you look into this first. I keep my computer and projector on a cart and attach my Wiimote to the cart with a clip-on tripod. This way if it moves, I do not lose calibration.