If you are still thinking of moving beyond your CoolPix, B&H has some
very good used camera offerings, and is a reputible vendor. They have a
very good D7200 + two lens package for $1049.95, which I would highly
recommend, and it will perform better than the D300S.

https://www.bhphotovideo.com/c/product/801803381-USE/nikon_13533_d7200_dslr_camera_with.html

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Regards,

Savageduck