[hociman]

A Canopus (QuickTime video only) is cheap, and has a few issues. A Mojo is not as cheap, plays more than just QuickTime, and doesn't have the issues a Canopus has. A SYNC I/O (I hear reports of SYNC|HD shipping) if you are going to use Mojo. A video distribution amplifier (DA) to display the picture on more than one screen, regardless of playback hardware choice.

This is a glossy generalization that should get you started.