For cold weather and high altitude, liquid fuel stoves would be more reliable. Butane can be a problem under some conditions. Liquid stoves really limit your options. Optimus makes some really good ones but they aren't cheap. They make the Svea 123 that I showed above. They also make one called the Hiker Plus but be ready to pay over $200 for one. It's very similar to discontinued 8R that Huntsman posted. They make a smaller, cheaper one called the Nova but I've never seen one.
MSR also makes a well known liquid fuel stove.

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