Sanyo PLV-Z3000 Projector Screen Recommendations
Brightness and black level performance are the two key factors affecting screen choices. I would prefer to recommend a high contrast light gray type screen to improve black levels slightly. That is probably the way to go, assuming you are not using a screen large enough to make the projector too dim for the Pure Cinema mode's slightly below average brightness. Let's say that, in general, a high contrast gray screen would be ideal for screen sizes below 100 inch diagonal. For 100 inch or maybe 106 inch diagonal screens, better to stick with a white surface with some gain, such as most manufacturers offer, including the Carada Brilliant White surface (gain of 1.4) the Stewart Studiotek 130 (gain 1.3), and similar screens from other major manufacturers.
Of course, if you are stuck with some side ambient light, the High Contrast gray screens are the way to go, but keep in mind the screen size limitations.
If you are not as critical about ultimate image quality, you can run the PLV-Z3000 in Brilliant Color mode, and now you have a projector with solid average brightness, in that movie mode.