The Nikon F case is my favorite. The straps attach to the side of the case, preventing strap wear on the camera. Moreover, the leather strap has steel liners where they attach to the strap, thus the strap will never be cut through. Finally, the leather strap covers a nylon core. Thus even if the leather breaks, the camera will never drop.
The case has cutouts for everything you need to access, so there's no reason to take the case off except to change film.