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You mentioned "we" are going to SF. How's your traveling companion with you taking lots of pictures? Do they stand there impatiently while you spend several minutes moving around looking for a good composition with the prime lens? Or are they patient and supportive of your hobby?
If it's the former, then having a zoom lens can be handy. Just shoot and go. Keeps everyone happy and you have a better trip. The 18-70 is probably the best range.
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