The Yashica Electro Rangerfinders tend to have nice lenses and are quite well regarded if you can find one in good working order.
The Olympus 35RC is also a really nice camera.
The Olympus XA is a real gem - small pocketable, even with the flash connected to it. (make sure it is the XA rather than the XA1, XA2, XA3 or XA4), since the XA is the only one that is a rangefinder. They can be found quite cheaply.
Things to watch out for - they are old - things jam such as lenses and aperture blades. Things degrade, such as the oil inside the mechanisms, which can lead to slow shutter speeds etc.
Sourcing Batteries for some of them can also be a bit of an issue. Quite a few are mechanical and don't need batteries, however some of the later ones need them to power the light meters.
Speaking of which, quite a few of them have Selenium light meters built in which don't need batteries, however the Selenium cells inside the Camera can degrade over time and become faulty.
Another issue is that many of the foam light seals used in these Cameras revert back to a gelatinous black goo after so many years - you can repair them using modern foams/felts and there are many guides on the Internet on how to do so. If you're really unsure about the fact a camera is lightproof, you could always use black gaffer tape to make sure
A good source is Charity shops - a lot of people are getting rid of Film cameras and donate them - sometimes you can pick up a bargain
