Greetings Arthur - I like Version 1. It seems to have that right amount of contrast, density, and believeablilty, the last one may or may not being important to anyone. It has the feeling of expanse, dread, and mystery. The only thing that bugs me at bit is that it seems slightly tilted (CW) even though it isn't. It must be the varied elevation of the land mass in the distance.
My other comment, even though it looks fine, is that if you have a RAW version, ensure that there isn't any banding in the sky, which can happen when there's graduated color (or brightness) like this. It usually creeps in w/ JPGs, the reason I often shoot both JPG and RAW simultaneously. Just in case.
-Greg