I'm looking for a cheap projector screen for my home theater. But I'm wondering why the prices vary so widely? I saw one 120" screen, white, that's electric, for $250, and another, silver, non-electric, for $1,600. I know the differences between white, gray and silver screens. I've been using my white wall all along, but I want to move the "TV" to the front of windows, which is why I'd love a electric screen. But is the $250 screen going to be *that* bad? (Link to the $250 screen.) Are there any other screens you guys would recommend? And please don't recommend DIY, I don't want to do it myself, and I want it to at least roll up, if not electric.