I don’t even know enough to fill out this details box.
http://www.projectorcentral.com/
good place to start- check out the buyers guide
http://www.projectorcentral.com/home_theater_buyers_guide_6.htm
Probably something like the Optoma HD 20— if you can somehow get your budget up to around 1500— you’ll have a lot of great choices.
Ask if you could use church basements that have a stage of some sort you may be lucky there.