3d is a "ride" thing that people like do do every once in a while at a theater as an escape becasue its fun on a 90 foot screen. 3d needs a very large screen. even a ultra nice panasonic vt series 65inch 3d plasma screen in a common sized room is not nearly as enjoyable "3d experience" as a cheap 100" screen and a cheap 720p 3d projector.
Actually to be honest, not even talking 3d, i would prefer "any" newer entry level 1080p projector and dirt cheap painted wall, no screen material, over a 70" sharp or a 65" panny. size wins over quality by a long shot here. ive seen many impressed by 100" 720p content over their 50" 1080p at home.