The AE900 uses smooth screen technology, and when I've seen it, I have always thought that it looked a little bit soft. Basically, Panasonic very subtly blurs each pixel so that the screen door effect becomes invisible. Unfortunately, to my eyes, this appears to soften the image.
I had seen the AE900 and the Sanyo Z4 almost back to back days, and the Z4 completely blew the Panny away for sharpness. Yet, with the newer AX200 I think that we have a considerable jump in sharpness from the same smooth screen technology and they really have toned it down so that you get both really sharp pixels, as well as a total lack of screen door effect.
There is not a good solution for the AE900, but read the reviews here, at Project Central, and at Projector Reviews, and you may find a far better projector right around $1,500. Heck, the new Sany should be around that mark and is a 1080p model.