BrightLink 436Wi ($1,250): The BrightLink 436Wi is the first interactive, short-throw Epson projector that can be moved from room to room. Using a native WXGA (1280×800) resolution 3LCD system and offering VGA and HDMI ports and dual pen support, the BrightLink can project onto any existing whiteboard, wall or other smooth, light-colored hard surface. The 2,000-lumen 436Wi also has built-in annotation technology that allows teachers and students to virtually write on a projected image from a variety of sources including a PC, tablets, document cameras, Blu-ray players, VCRs and more.
PowerLite 935W ($1,199): Designed for large classrooms and naturally bright rooms, the PowerLite 935W delivers widescreen, ultra-bright images with WXGA (1280×800) resolution and 3,700 lumens, making it suitable for nearly any lighting condition. It offers a 16-watt speaker and microphone input for voice amplification to the entire classroom and includes HDMI and RJ-45 for presenting content over the network, broadcasting important messages and monitoring and controlling a networked projector remotely.
Here are complete specs on the 436Wi: http://www.epson.com/cgi-bin/Store/jsp/Product.do?sku=V11H536020
Here are complete specs on the 935W: http://www.epson.com/cgi-bin/Store/jsp/Product.do?BV_UseBVCookie=yes&sku=V11H565020