Hello Team,
This is my first post and I would love some feedback :)
First let me give you all an idea of my plans.
After reading many of the posts here, I found myself thinking about either the Mitsubishi HD1000U or the Optoma HD72. After further reading and using the Mitsubishi calculator, it seems like the offset is going to be a problem. So now I have to find a projector that would work with the spec for the room that I have listed below and don't have the budget for a Bright yet flexible DLP unit. I seems like under the $2000 mark, I have very few choices that would work great in my setup.
I'd like to purchase a projector that could be used in this room, here are the specs:

The room is/ can be light controlled for movies, but I would like some lighting for things other than movies (sports and occassional HD programming).
The dimensions of the room are:

18 1/2 feet long
14 feet wide
7 feet 3inches tall at the center, with pitched sides (the room is the upstairs of a Cape design home).

With the pitched ceiling I can at most get a fixed frame 92 inch screen (like the Mustang with 2 inch borders). This would put the bottom of the screen 28 inches from the floor and would put the top of the screen at around 13 inches from the ceiling. Although I would love to have a 100 inch screen, the 92 is all I can have and that seems like a stretch since the bottom of the screen would sit so low.

So this brings me to the following questions.

1. Have any of you, set up a projector in a similar room, and if so what size screen did you end up with and which projector did you go with?

2. Is there a projector under $2000 that would allow this or a better setup without Keystone or other problems like big offsets?

3. how bad is the view if the bottom is that low (28 inches from floor)?

4. Have any of you used the Mustang screen, and if so, How is it?

5. Which Projector would be best suited for this setup given all of my restrictions?

6. What it the smallest (shortest length) ceiling mount that I can use to keep the unit well ventilated but still close to the ceiling?

Thanks in advance to anyone who answers!

I might have a solution for you. I had a similar problem. My ceiling is 8' but the walls are only 6' at the front (screen) and rear. I wanted a 96" screen, but mounting the top edge of the screen at 6' would have caused trouble - I didn't want my center channel that close to the floor.

Instead, I built a "box" to mount to the wall in order to "offset" the screen off the wall, and allow it to be mounted higher. In this way, I put my center channel on an 18" stand and it cleared easily.

I have one row of seats about 10' from the screen, and another about 13'6" from the screen on a riser about 10" tall. The riser calculator recommended a bit higher, but I didn't want a step. Instead I used a 2x10 with a sheet of 3/4 plywood. It amounts to a tall stair, height wise. I have 5 seats on the back row, and 4 on the front, so the stagger all but eliminates any sight line issues.

Check the picture "view from the seats" in this post (http://www.avsforum.com/avs-vb/showthread.php?t=793461) for a view of what I'm talking about. If this in any way would help your problem, I can take some additional pictures for clarity.

Hope this helps...

Thanks for the reply. Unfortunately my setup is slightly different than yours. My screen would be position where your door is in the pictures. So that means that it will be up against the wall that falls between the two pitched sides. because of the angle of the pitched sides I can only go as high up on that wall (before the corners of the screen touch the pitched sides) as 6 feet 2 inches or so. At that hight I can place a 92 inch fixed wall screen (45 inch X 80 inch) with two inch borders all around. The plan is to do a ceiling mount with the projector, and not have to use the Keystone adjustment to do it. This kind of pushes me into having to get a projector with Lens Shift, which means that the Optoma HD72 and the Mitsubishi HD1000U are out of the question. Unless someone here has a work around for this. Based on the offsets that these two units have, it seems like the picture would be too low (lower than the screen).

What about the Panasonic PT-AX100U? It's the successor to the PT-AE900U that I have. My lens shift was plenty to help me, and the 2x zoom allowed me to mount it on the wall. Actually, with my 8' ceilings and 6' wall height, I couldn't ceiling mount and get the picture low enough.

I'll look into the PT-AX100U. Would you happen to have any screen shot of your AE900U in action? I'd love to see the quality of the image in both movie mode (Totally dark room) as well as with some ambient light. I appreciate your help, thanks again.