What screen for high ambient light room?


Hi Guys and Gals,
There is no way I can totally darken my media room. It started out life as the music room until I decided to switch over to a projector. It is contiguous with other rooms that have widows. Viewing is compromised until after dark so I have to watch my formula one races in the light. I am using a Stewart Grayhawk screen 113" diagonal and the projector is a JVC DLA RS20. I will switch to a laser projector when the prices come down. What would be the best screen choices for my situation?
128x128mijostyn
What’s your current projector lend to screen distance? What picture mode are you in? Is it bright enough? 
 
Model in mind high gain screen reduce black levels, so you want it as low as possible while still being bright enough (and of course ALR screens are more fun icky with figuring this out).
Thanxforresponding!

Distance is 18 feet. What ever normal is. I am an encyclopedia of Hi Fi information and the reciprocal when it comes to video.  
@mijostyn

What ever normal is.
Go into the settings and see which you are on:
Cinema 1, Cinema 2, Cinema 3, Natural, Stage, Dynamic, User 1, User 2, THX

Is it bright enough? If you go on the remote and select Cinema 2 and then THX, how does they look (brightness and color wise)?