Hopefully you got your D7200 and 18-200, prices on the D7200 are great now that the D500 is out, LOL.
If you didn't secure a zoom lens you should also consider the 16-85, or the new sigma lens.
I have a few primes, one thing to note fast primes even on DX result in very shallow DOF, a very different look then what you get out of your iPhone, unless it is in portrait mode. SO yes helps with low light, but beween VR and the D7200 sometimes even a fast lens you want to stop down for a little more DOF.
Oh, last tip, DO NOT BUY NEW, used either FM, eBAY or Nikon refurbished, or CL offer screaming deals.