James,
Either of those sets would be great, I would probably go for the 15x70 but that is personal preference. They would both need tripod mounting for all but the shortest observing session as they are too heavy and the magnification too high to effectively hand hold.
If you are interested in a quick squiz of what is around before your scope cools then a set of 7x50s are great to orientate yourself in preparation of your observing session.
Cheers
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