First, I must say I'm no expert, but I watch 16:9, 2.35:1 and occasionaly 4:3 on my screen, and I have a 16:9 screen.
16:9 fills it totaly,
2.35:1 can sit at the top, middle or bottom of the screen, leaving black bar(s) which can be masked (but I don't just yet cos it isn't really an issue for me).
4:3 images overlap the top and bottom of the screen, but I crop the top and bottom to give a pseudo 16:9 image just like on a widescreen tv.
In your case, a 100inch wide 16:9 screen would work like mine does. If you watch a lot of 4:3 stuff, and you don't want to crop it, us a 4:3 screen, and mask the unwanted bits when watching a 16:9 or 2.35:1 movie.
My situation tends to dictate a widescreen style screen for the width I want, so my choice was limited to start with.
Originally Posted by elmalloc
Who says Cameron is "right" and why do we care about him so much - lol!
I trust Gary Lightfoot more than James Cameron.