I recently bought a Focupix remote controlled, 92" diagonal, electric, 1.3 gain screen for $179. I was hesitant because of the price, but it has been well worth the money. The size is what I needed for my media room. I originally had an OHP setup and replaced the screen in an old pull down with blackout cloth, which worked well for a time.
I since have gone with a commercial projector and the Focupix screen. Although the OHP setup is still used for outdoor movies and holiday displays.
If you want to see a video of the Focupix screen in action you can click on the link to my website. It is an 8min video of my media room setup, but there is good video of the electric screen with some projections in daylight. The quality of the video is not the best, but it it will give you some real world input.
video of Focupix screen and media room setup - 8 minutes long
http://mysite.verizon.net/yub_yump/home_theatre.htm