I have a number of 70s fixed lens rangefinders and a Fed-4.
The Fed-4 is, for me, a wonderful camera and much more robustly made than internet 'wisdom' often has it. Also, the Industar-61 is a beautiful lens. The only problem with it is that it's quite a bulky camera.
The Japanese fixed lens rangefinders are much smaller and take good pictures, but, as the previous commentator said, lack charm.
I paid 10 UK pounds for the Fed-4 and 5 pounds (I think) for the little Chinon fixed lens rangefinder I use. So it's easy enough to dip a toe into the water cheaply.