Childhood Memories

Another one of my dear Burmese, struggling into a teddy bear.

Just a request I would like to make...

Would anybody be able to recommend a lens for the D7100. I plan on treating myself to one but I can't figure out which lens to get. I would be photographing moving animals/people, macro and a few night scenes eg moon. I was also hopping for it to have a fast AF and sharp images. My price range would be near or under $750.00. Any help would be highly appreciated! :)

Thanks,
Lone Wolf