All the choices were a 1.78 (16:9) aspect ratio, which is for HDTV, so I selected "other". Most DVD's are in 1.85 or 2.35 and abover ratio, like in the theaters.
Anyway, I have a constant height setup, using a 2.35 DIY (Cinemascope) screen which is 51" x 120" and an Anamorphic Lens from Prismasonic, and a HTPC to do the proper scaling to reclaim the lost pixels used by black bars (letterbox) on the top/bottom.
"Constant Height" means that ALL aspect ratios share the same height, just the width changes. It is MUCH easier to mask off the sides of a screen, than the top and bottom, using curtains or whatever.
So standard 4:3 (1.33ar), 1.78 (HDTV), 1.85-2.35+ (DVD's) all share the same height. Once your able to experience a true cinemescope movie with no black bars, just like in the theaters, you will never go back to 16:9 screens.
