In the grand scheme of things, this is a premium projector. While it is very well balanced, and has very good black levels, my first tendency is to recommend a high contrast gray screen for most people. I say this because it will overall lower black levels.
That said, this is a projector that in most cases will end up in a nice, light controlled dedicated theater room. If there are no ambient light issues that such a screen would help with, then, let's keep the options open, and dig deeper.
If you go with a large screen (say 120 inches or a bit larger), the black levels (and bright levels) will be darker, of course, than on a smaller screen. As a result, larger screen folks may not feel the need to lower blacks further.