I was in the exact same situation a while ago and went with the Fuji GS645. The shutter isn't the usual quiet "click" of most leaf shutters (check out my video to hear how loud it is), but it's ok for most things. It's the only metered, modern rangefinder with a mechanical shutter.
I was also seriously considering the Zeiss Ikonta 532/16.
The Bronica RF645 has a very solid feeling, and it would have been on my shortlist if the shutter wasn't electronic.