Not sure if I have the expertise to recommend a screen. Plus I'm American and we think in Dollars :P. But sounds like 200 EUR will get you a nice screen. I can say the projector is bright, so I wouldn't recommend any screen under 120" diagonal if you are not sitting more than 1.5x the distance back of the screen size. Miwo has a 100" diagonal screen (I think, or its 84" diagonal) and he says it scorches his eyes. I have an Elite 125" 1.0 gain screen which should do well in my set up. Check the screen forum or ask here on this board in another thread.
RBE is rainbow effect. It is a flash of color in high contrast scenes. See if you can demo a good DLP projector from someone you know or at a retailer. Here is an example of what it would look like if you are sensitive to it. Make sure no one you would use your projector with is sensitive to it as well. If not, congrats! We hope to see you soon posting on this board as an owner of the HD131Xe.
Oh damn, I saw the video and that is quite bad. Right now I don't watch a whole lot of movies, but when you have a screen that big I bet I will be watching much more. I live on my own, and only sometimes friends or family coming over. So i'm pretty much buying it for myself. I could try and find a shop here that lets me demo a projector, and if I see such a rainbow effect. will that mean i'm gonna be seeing that on pretty much any DLP projector?