I know this thread is a little old, but I hope I'm not too late to help out if I can. Let me start by saying that I am a big fan of anamorphic lenses, and having installed and experienced them, I fully understand their benefits and drawbacks. They can provide a powerful, immersive experience, and I love that. But there are also some technical challenges that need to be worked out to give a successful presentation.
One aspect (pun intended) that is not often considered is how the screen will look within the room. For a room that is relatively wide like yours, Sonnie, a 2.35:1 screen would probably look very good. In some narrow rooms, you might get a "wall-to-wall" screen effect with a 2.35:1 screen; but the relatively small vertical height of the screen compared to the ceiling height might make the screen itself look small. In such a case, one might be better off with a 1.78:1 screen. There are many factors to consider in good home theater design, and we just need to make sure we look at them all.
I agree with your decision to use the lens memory feature. Not every projector has this, and it is a great asset. And I don't think you will have much problem with brightness or resolution, provided your screen isn't too huge. As for the aspect ratio, have you considered using a 2.0:1 screen? I know you would have to get a custom screen built, which may or may not cost more, but either way it is still much less expensive than using an anamorphic lens. Most manufacturers are willing to accomodate custom screen sizes. By using a 2.0:1 screen, you would have the largest average picture size no matter what aspect ratio you watch (see diagram). Notice how close in size the 2.35 and 1.78 aspect ratios are. Yes, there would be black bars with every aspect ratio, but their size would be minimized and unless you have a masking screen or masking curtains (for 2.35:1 screens), everyone has to live with them anyway. I know 2.0:1 screens are not well known (nor are they a standard size with most manufacturers), but they are starting to turn up in some high-end screening rooms.
Since you have the lens memory feature, using a 2.0:1 screen is an option for you that most people don't have. If it were my own theater, that's the way I would go. I would program in as many aspect ratios as the projector allows.
On the diagram, I selected a screen that is about the same height as the screens in your diagram for illustration purposes. Your screen size might vary depending on seating distance and projector location. Hope this helps!