David, I think that although the power lines are less distracting by your crop, the open expansiveness of the image is now lost.
I think the crop is an improvement, but I might be inclined not to lop off the mountain tops, however.
And yes, I say clone out the power lines. If you were shooting this for Nepal Power & Light's annual report you might want to leave them in. As elements in a breathtaking landscape, they're a distraction.