There are 3 things that will directly effect what projector you can use. Size of screen, Distance from screen (throw), Brightness of image (Lumens). You will need to find a projector that meets these needs. Size of screen and throw are directly related. For instance... If your screen is say 14' x 20', a projector with a short throw lense will likely need to be about 18' - 24' away from the screen to fill it. This means your throw distance is 18 - 24 feet. Find projectors that are in your budget, then look up the specs at projector central and see if it throws 18 - 24 with an adequate brightness. In your theatre has stage lighting that will be on while projecting you are going to need 1600 lumens of brightness or more. I have personally had great experiences with Sharp projectors. They have great contrast ratio (2000:1), good lumens (2000 or better) and can take a beating and still work. I use a Sharp XR10S and a Sharp XR20X. The 10S is 800x600 resolution and about $650.00 (This is how many pixels make up the picture). DVD Resolution is 720x480. Widescreen is 852x480. Many PC's these days are at 1024x768 resolution. So a 800x600 projector will show a DVD just fine, but images from a PC will not look as good as it does on your monitor. The 20X is 2300 lumens, 1024x768 resolution and about $900.00. There are many "budget" projectors available that have attractive prices but the specs aren't so good. Pay attention to Contrast Ratio. This is how sharp the image is on screen. Many "budget" projectors have low contrast ratio (250:1) Lastly, you are most likely going to want a Presentation Projector, not a Home Theatre Projector, unless you are projecting in near darkness. Hope this helps. -B