I think the Pentax LX is one of the nicer cameras. Decent size, sturdy and affordable. And reliable.
I'd also take a look at the Nikkormat FT3. Takes all of the AI/AIS and pre-AI lenses and is a lot like the Pentax. However, the shutter speed selector is a ring that surrounds the lens mount.
There probably are literally hundreds of cameras from which to choose.
I'd think about the lenses: Nikon, Canon, Zeiss, Pentax, Minolta, etc.
One thing about electronic cameras. When the electronics go, it's time for the camera to be binned (tossed).