Karen, I got an Epson from Office Depot which I waited to go on sale for around $300. The pic is good, but no go on the built in sound. If using outdoors, you really need to use a receiver and speakers in order to hear good. I had an old receiver/speakers not being used, so that wasn't a problem.
I really like the screen I got, which is a Camp Chef OS-144. Camp Chef makes several different size screens. Here it is on Amazon, which I also got on sale for around $180, I think. What I really like about the screen is it has a removable back panel, that let's your project from the rear. The Epson have a setting that reverses the image for rear projection. When rear projecting, nobody can interfere with the projection when they get up and move around in front of the screen.
We just discussed this recently in another forum. let me see if I can find it, cause it had other projectors and such in it.