My First OverHead Projector

I have been playing with the idea of finally adding an overhead projector to my dedicated music listening room. The room is 17.5 w x 26 L x 9 h. I have two sets of speakers in the room, (1)Magnepan 3.6's which are approx six feet into the room from the short wall and four feet from the side wall, (2) Klipschorns which sit in the corners of the same short wall.

I could hang a screen on the short wall and have about six feet of viewing space between the 3.6's. Or, if I run the projector I can easily slide the Maggies to the side and open-up the entire space (which I do often when playing the KHorns).

Question is, what projector should I consider? I would consider buying something used to get started. Also, what is a good screen option?
No prob, here if you need help just email. There is learning curve but its not severe. Things like position to lumens but its not brain surgery.
I'd suggest buying new, there are some real values out there. Better to get a new bulb and a warranty. Some people dump fairly new units with pixel problems, geometry distortions, dust blobs, etc. on the used market. I'd also suggest waiting on the screen for a couple of weeks. Though the picture won't be nearly as good without one, it will give you some time to tweak and decide just what size you really want.
Myself and 4 close friends have bought 7 total units from $2000 to $10,000 used with never any issue. You can have bad luck but the experience has shown me that its not an issue. Just do your homework and trust your gut. Buy used and save some serious coin!