I'd second the Retina IIIC or IIC. (the III has a meter that you may or may not want to use) The capital C what the last generation, which means that the viewfinder has brightlines for all three focal lengths--50, 35, and 80. The lower case c model has only 50mm brightlines, and you need an add-on finder for the other lenses.
Build quality is superb, and the Schneider Retina-Xenon 50mm lens is probably my all time favorite on 35mm cameras. The other focal lengths require jumping through some hoops (I. focus in the viewfinder, II. read the distance scale on top of the lens, III. on the underside of the camera, dial in the distance reading, IV. back to the viewfinder, frame andshoot.)
The meter on my IIIC still works fine, and since it is a folder, the whole thing fits in the back pocket of my jeans. Probably the thing I like least about it is the countdown frame counter--when you load a roll, you have to adjust the counter up to 24 or 36 or whatever, then shoot down. When you take shot #1 on the counter, you can't take any more. So if you want to capture that last frame or two, you have to roll up the frame counter a bit so you can keep going.