Have you considered other camera models besides the ones you have listed? I too would worry they may become money pits. Contax servicing is available throughout Europe but not inexpensively.
In your shoes I would consider the later screw-mount Canons, or the earlier Leica-clone Canons, or other LTM clones. Or perhaps even an SLR.... Is being a rangefinder a must-have? I use my F6 for street photography and it is a tremendous tool and a great bargain in today's market.