All nice shots. I've enjoyed looking at them.
It seems almost sacrilege to say so, but for a spectacular "save" of a b/w one might want to consider the almost lost art of using photographic oils, such as Marshals. I wouldn't recommend it for every sunset or sunrise, since as the posters above have shown b/w photos have a quality of their own.
But skilfully done oils have as well. Just choose well. It's not for every b/w, some b/w are just too nice on their own, and oils will almost never be as good as a well done color print.