I had a couple of Bushmasters and they are good guns, check out Walmart prices before you go to a gun show. I agree with Smitty901 that gun show aren't the best value for new guns.
PS: If the scope hit you in the eye while shooting an AR-15 you probably weren't holding the rifle firmly enough against your shoulder the normal distance between an Acog scope and the eye is usually under 2 inches.
Remember not to skimp on a scope as it is just as critical in getting a good scope as the rifle.