Will you be watching content on your projector in the daytime, nighttime, or both?
Since it is primarily movies that have plenty of dark scenes, ask yourself consider this compromise--one that I did for years: Do I want to watch sports HDTV and even most gaming in the daytime, and save Movie viewing/other content that needs a very dark room for after the sun goes down? Can I have both? Consider, while the differences between the “Multi-media room” and a dedicated Home Theater can be dramatically different during the daytime, the “Multi-media room” can very much approximate a dedicated home theater at night when it is properly dark.
Some of you might be very lucky, in that you only plan to use your projector only in the evenings. I certainly hear from plenty of folks who tell me that. Typically that doesn’t include the sports fan types who might be watching their daytime sports on their 55” LCDTV. (How small, how sad!)