I have had a projector as a tv for the last 6 years. The newest one is unbelievable (Sony SXRD). It's pretty decent in a bright room and I have a motorized screen which dissapears. It has it's downside, but picture quality isn't one of them.
Bulbs are a cost, but convenience and awesomeness easily offsets it for me.
I am not particularly strict about turning mine off, but ultimately room type and whether you can ceiling mount a decent sized projector would be deciding factors.
I'd go and take a look at a few out of interests sakes. 4K Projectors are pretty pricey.
Thanks! I will definitely consider this!
the place where we want to put the tv has a ceiling height of 2.7m-3m. there is a perfect spot for the screen.