Rob47 wrote:
I started with a 5100 and now own a D600. I did not get rid of my 5100 and as stated above, keep it as a second body. I invested in the holy trilogy of lenses but highly recommend at least the 24-70 as a lens to use 90% of the time. Good luck as you return to the life of photography.
The 24-70mm f/2.8 makes sense, if you do a lot of studio work. If it is used as more of a walk around lens outside, a 24-120mm f/4 might be a better choice.