Scrambler
Well-known
The Problem is to me.. I am not at all seing me buying a camera with a cloth shutter, so all Leica's are out. The only rangefinder camera I like so far is the Mamiya 7 which is very much because of the rangefinder. Another thing is, anything Leica except for an M2 or M5 is actually much more expensive than the ZM. So it is basically down tho the ZM, a Bessa of any make or not trying 35mm Rangefinders at all (outside the Contax IIIA I have).
My suggestion would be an electronic slight risk but a great camera: a Konica Hexar RF. I've owned one, best RF I've owned. I don't own one: I now have an Epson R-D1 which is more electronic, and the same age. The electronic systems are actually decently reliable but not eternal.
You can look at Cosina cameras like the Voigtlander Bessa R series in one of 2 ways: they are decent and capable, or they are generic-label cameras being given elevated value by the 'Leica Aura.' Both are true. I own 2 Cosina built cameras, the CV about 5 years newer than the Ricoh-branded SLR. The price of the CV was 10 times the Ricoh, and 100x would not be impossible. The Ricoh is a retired student camera and has the body markings to prove it, but works perfectly 20 years later.
If it's the RF you like, with integrated viewfinder, then there are few options. All will be expensive. But you will be able to sell for the same money, assuming you can afford to buy and keep. The lowest price point, with some VF/RF inferiority vs the above, would be a late Canon RF with metal film shutter: like cloth in function but more durable. LTM only, but if you want to reduce costs this is almost an advantage: prevents hugely expensive GAS.
Given your existing Contax camera, a Bessa R2c would save you having to buy a new lens at all.