Meridian 810 Reference Video System projector like IMAX at home
The Meridian "810 Reference Video System" can shoot light in high density: 4,096 by 2,400 pixels with a 4,000 lumen lamp. It's essentially the same resolution as a nice 4K digital theater scan, although still not quite up to the relative pixel density of something like IMAX. But in a high-end home theater, slack-jawed and stoned on diacetyl, you'll probably not notice the difference.
The 810 starts at $185,000, not including installation or super-upconverting Blu-ray player.
Meridian 810 Reference Video System: King of all Front Projectors [Gearlog]
Previously • RED Scarlet 3K camcorder, James Cameron on the future of digital cinema, and trying to grok all these pixels

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Actually wouldn't that be the same as a 2K projector? I believe video resolution is measured on the Y axis.
It's expensive, but it's quiet, sharp, and the scaler really fills in where the source is missing. A very compelling combination - and a great use of this technology. If you have the money . . . you owe it to yourself to consider it!
Check out this review:
http://www.hometheaterreview.com/front_projector_reviews/meridian_810_dila.html
Thank you, Bob Stuart and Meridian for getting it . . . RIGHT!