Whatever good can be said of all the cameras above, which are no doubt good, add my Fujica ST 901 which has been going for over 40 years. I don't even know how many photos has been taken with it, but certainly over 20 to 25 thousand, from b/w to color to slides. It continues to have very accurate exposure. It uses a silver oxide battery, 544 or equivalent. The only time I experienced a cold issue was when the battery in it was nearing the end of its life. I always kept a spare so no problem. But if your only battery goes south, you have purely mechanical speeds from 1/60 to 1/1000 speeds as a backup.
I think it was the first of the step-less shutter speed cameras. Other nice things is stop-down metering if needed, and shutter speed measurement on non-Fujica dedicated M-42 lenses. And the only M42 lenses I found that won't mount are certain Mamiya lenes.
Being M42 mount, there are an incredible amount of good lenses (that are usually inexpensive) available. One disadvantage of the Fujica Fujinon lenses is that they are usually expensive these days. They are incredibly sharp however. Back when I wanted them the most, I couldn't afford them. But I learned there were a lot of inexpensive, but good lenses that were made to fit the Fujica line, or those by Vivitar with the TX mount, that were quite good as well. So I only have six Fujinon lenses.
Some people complain about the shutter speeds in the (bright) viewfinder. The don't display a 1/250, but 1/200, and other speeds are the same. I found as long as I was in the ball park, I didn't care. After all, the shutter would be step-lessly accurate. I really like the led readout in dim light.
Another good option in my experience, was the Contax 139Q, and the Contax 167mt. The only real disadvantage of the 167 is a little more weight because of the build-in winder, and just the fact there is a winder and no provision for manual film advance.
Probably more to your satisfaction would be the Yashica FX 103. It is battery dependent (not mercury) but it does have some really nice features. It has aperture priority, shutter priority, and program exposure modes. It takes a winder, but I don't use that as I don't like the added weight and noise. The Yashica Yashinon lenses are very good with an adapter, as well as their other lenses in the C/Y mount, but not Yashikors. More fun, they of course use the Contax T* lenses as well. The dedicated flash on those two cameras is unbelievably accurate.
EDIT, I forgot to mention that the FX 103 has the option to select exact shutter speeds, but I think they are battery dependent as well.
Sorry for the long post, but I have and use the cameras I mentioned so I can talk about them with knowledge and experience.
