Im looking to get my first screen. Will be for an epson 8350. The screen has to be manual or fixed and budget is around 250. I would prefer manual but really dont want any wrinkles. I heard somewhere that there are some manuals that are some materials that dont need to be tensioned. Is this true? If so what what companies make them and how much do they cost. If this is not true any reason not to get a Jamestown?