If you want a True 3D projector I'd wait a couple of years. There is no consumer 3D standard currently, although HDMI announced 1.4 they also announced they will be adding to the spec later this year to expand the available 3D formats.
Although you can possibly get a pseudo 3D effect right now with the current standards you won't get the clarity of the new 3D movies without the new standard. It has to do with video streams being separated and compressed individually to have separate frames for the left and right eye.
Current video compression algorithms look at the differences between frames and only store the necessary data for changes between the frames and not the whole frame individually. So even if a source is 120fps and tries to use odd and even frames for 3D now it won't be as good as films like Avatar until the new standards and source material is available
Whether 3D will catch on for the home is questionable amongst the general population. Enthusiasts will have it, but will the average person buying a TV care about it. It has two major obstacles.
1. The need for glasses. Although there have been displays that don't need the glasses they currently have a very narrow viewing area and not practical for most homes. If that technology can be improved it would definitely help but I don't see that happening in the next 5 years.
2. Source Material. Although there will certainly be more movies made for 3D how much it penetrates the home market is questionable. Start broadcasting sports in 3D and you'll see wider acceptance
Buying a projector now that can do a propietary 3D now will be about useless unless it can be upgraded to the newer standards.