A Mamiya TLR might work for you, especially with a normal and perhaps a longer lens for portraits. The bellows should allow you do do some close up work...but the paralax (sp?) on a TLR would have to be taken into account. Not what I call a light camera, either...but well built. Since the shutter is on the lens, it can be fixed or replaced without affecting the camera body.
(I have no connection with the above camera)