As Jason says, the Electros aren't small. I used to have one and couldn't get on with the size/weight or ergonomics. A compact SLR - Pentax ME/MX, or Olympys OM, for example - is smaller. Lots of people swear by them, though. A lot of the more compact 70s rangefinders are shutter priority or program mode only, unfortunately.

Have you seen: http://www.cameraquest.com/com35s.htm