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@Clockwise
Here is my setup. We don't use it much just watch the odd film now and then on it. What you need to work out is where you want to put the projector and then how bright you need it. For us we project from a distance of 3m and with the lights out or lights that point away from the screen a small projector is enough, a smaller "pico" projector wouldn't be big enough. If your projecting a "diagonal" image then you normally need to spend more on the projector to get a bigger range of "keystone adjustment" if you can project from somewhere directly inline with of 5 degree off the center of the screen then it will be lots easier(hence my one being mounted mid ceiling). If I wanted a shelf on the wall I would have needed a "long throw" projector as the majority of ones in the type I was looking at wouldn't have the zoom.
projector mount
http://i160.photobucket.com/albums/t171/pimptasticmofo/IMG_20140509_211134_zps65105644.jpg
screen 2m x 2m ikea blind + 5050 leds
http://i160.photobucket.com/albums/t171/pimptasticmofo/IMG_20140509_211111_zps4ade0353.jpg
If you are lucky you can find a calculator thing for it. Most will have one on the makers site tho as it's a serious factor when buying.
http://www.projectorcentral.com/Acer-H6510BD-projection-calculator-pro.htm
If you already have your eye on one then it's going to limit the position of it so just work off of that.