A lot depends on what you're trying to do and how you intend to try to make money off of it. My initial reactions though are that if you're going to buy projectors these days, don't waste money on anything that isn't 1920x1080. As for the screens, we had the
Draper rep in last week and he told us the same thing you'll hear from a lot of people -- trying to do front projection on a rear projection will result in a loss in lumens because the surface inherently lets light through instead of capturing it all on the surface. That said -- if you're trying to blend multiple projectors together on the same surface, rear projection screens work well because they soften the edges.
If you're getting into video, don't forget that you need sources. That means a DVD player, a Blu-Ray player, at least a few
DVI and
HDMI inputs into your system. Speaking of which, the
switcher you've shown only has one DVI input and no native HDMI inputs. I anticipate that will quickly become a problem for you.
Before we get too far into model numbers and quantities though, tell us a little more about what you want to be able to do with your video system and what you're currently doing (if anything) for video.