Any projection screen gurus in here?

[Dace]

I'm looking to get a VPLAW15 projector and was wondering what kind of screen to get.

Should I get a 80" Carada Criterion screen in the 1.78:1 format or a 80" Carada Criterion screen in the 2.35:1 format.

A 1.78:1 80" screen I find would be too big when watching HDTV/16:9 content (considering my viewing distance), but most Blu-Ray movies are in the 2.35:1 format which would look small on a 1.78:1 80" screen.

A 2.35:1 80" screen would produce a 16:9 image of 60" diagonal. 60" would be big enough I think.

I could do like in the movie theaters and place thick dark curtains on either side of the screen and "close" them when watching 16:9 or 4:3 content. What would you say of that idea? What are your thoughts? I aslo figure, the "black bars" projected wouldnt be very black..therfore it would be best to go with a 2.35:1 screen to prevent the bars.

Also with this projector should I just opt for Cinema White screen? I am able to make the room pitch black, but at times I might like some minor ambient light.