I am going to take a bit of a different tack. Buy a Nikon D610. I know it costs a bit more than what you are considering. But it has a much larger sensor, which will produce much better results for the types of shots you are considering.
If you buy a crop-sensor body, you will quickly run into its limitations. You will then want a larger sensor (full-frame) camera. Buying twice is always more expensive than buying right.
If you are still reading, please consider that the camera you choose is a proportionally small part of the money it will cost you do to photography well. The $500 to $700 larger initial investment will save you money in the long run. Once you add up the total cost of lenses, flash units, stands, umbrellas, tripods, and all that, the higher cost of getting a better camera to start with sort of makes sense.
When I first went from film to digital, I spent a lot of money on crop-sensor stuff. I ran into the limitations of crop sensors relatively quickly. I sold it all, and put the proceeds toward what I should have bought in the first place. The downside? Good full frame glass is more costly than crop frame glass. I don't know about Nikon, but in the Canon world, the image quality improvement is worth the money.