The coolest of my rangefinders is my old Olympic model Nikon S3. I prefer the old black-paint cameras, I also have black Leica M3 and an M4, as well as a black-paint Canon 7 with a 50/.095 lens. I also like the bigger rangefinders, my favorite is the Fuji GSW690III. The biggest is a Super Speed Graphic 4x5.
Recently I picked up an FED S with it's original 50/2 lens. It is definitely cool, and I am enjoying shooting it now.