There's an Agfa Karat 36 listed int he classifieds right now. I have no relation to that seller but the Karat 36 is one fine Rangefinder camera. Too bad that one needs rangefinder work.
It's fixed-lens but all the lenses available for that camera, were firecrackers. The Solinar is the less-exotic but super-sharp Tessar variant built for or by Agfa.
It's extremely well built; built to compete with the Retina rangefinders ... and the optics are the same as the Retinas. Fortunately, the Karat is not as well known as the Retina and the prices are much more reasonable.
If you need lens interchangeability, the early Kievs are fantastic and well built with excellent rangefinders that almost never go out of adjustment. Earlier the better with the Kievs. These are of course a little pricey but not nearly as high as a Leica; and a whole lot more user friendly than the early Leica IIIs that cost twice as much.
And of course there's the original Contax II and IIa, which is again more money.