Firstly, if the the top of the screen is only 4" down from a 9' ceiling, you're going to get a cricked neck!
That is very high up..I would try and lower it if you can..
You really need to calculate your seating position first before deciding on the screen size..
What is the length of the room?
Primary seating position should be approx. 61-65% the length of the room, for best audio quality..
From there, you can then determine the best size screen..
As far as projector choice..I would go for the Optoma HD20..
By all accounts it's a very good entry level 1080p projector..
Oh.. and welcome to the Shack..
That is very high up..I would try and lower it if you can..
You really need to calculate your seating position first before deciding on the screen size..
What is the length of the room?
Primary seating position should be approx. 61-65% the length of the room, for best audio quality..
From there, you can then determine the best size screen..
As far as projector choice..I would go for the Optoma HD20..
By all accounts it's a very good entry level 1080p projector..
Oh.. and welcome to the Shack..