Ok, thanks for the answers.
My PJ needs about 11.5' to throw a 100" screen.
There is a back door in the wall on the end of the room where my screen would go if I changed orientation. I'm going with a electric pull down in either case, so it's not really an issue. I figure I'll pull a curtain across the back of the room to make it look nice when I lower the screen in front of it. This is a dual purpose room, and the screen isn't going to fit into the day to day decor, according to the wife...
My current surrounds are some Klipsch Synnergy's. They are triangular, and really need to be wall mounted.
So are you saying that an in-wall speaker within a foot or two of that left wall in the current orientation wouldn't be a big deal? Also, how do your mains sound inside of the width of the screeen, I would imagine that you lose some separation, but is it noticeable?