I'm pretty sure you've posted the details somewhere before, but just so I don't have to go searching, how much did this setup cost you?
The projector was 700 euros. I don't have a screen yet. I also had to paint the walls, but if you don't need to do that, it should be just the projector.
I haven't mounted the projector to the wall or ceiling yet. but that should be around 50 euros or so. It's the Optoma HD131xe.