I am interested in buying a 16mm camera to shoot a documentary but there are so many out there I am a little worried. I don't know that much about cameras. Which manufacturer should I avoid and why? Who makes the best cameras? Is the Bolex Rex 5, Beaulieu R-16, Arri 16 BL or Canon Scoopic any good? Which manufacturer still services their older models? Which camera has tons of accessories available in the secondary market at an affordable price?