Check out Elite screens too.
You may want to purchase a 2.35:1 screen, then you would add 8-10" below and above the screen (I added 2x8 boards on all 4 sides - screwed to the wall, so it would all be uniform and look better)... and cover them with the blackest of black velour material you can find. There are some threads in various places that talk about the best black material to use. When you watch a 2.35 movie... you set your lens preset to zoom out and make the black bars move to the black velour area... and you can't see it. You'll setup two lens settings on your presets to change them back and forth. I have buttons programmed on my remote. When watching a 16x9, you'll have black bars on the side. If you want you can get piano hinges and add swinging panels to absorb the black bars... makes it look like you have a 16x9 screen. The only issue is you have to set your screen panels each time you change the aspect ratio. I have been threatening the black panels for years... just haven't done it yet.