Hi. I am new to APUG but here's my two penn'orth.
I have a Zorki 4K which I have owned from new. It is easy to use, reliable and built like a tank. Just remember never to adjust the shutter speed unless the camera is wound on,(I believe FEDs are similar in this respect). Easily available on ebay at very low prices.
I would also recommend the Olympus XA. A very small full frame rangefinder with an almost silent shutter. I use an XA2 regularly, the only difference being the XA2 has zone focussing.
Good luck in your search.