I started out with a D5200, and I now have a D5300. As said before, I was intrigued by the GPS, but it is not all I had hoped for.
I recently bought a D300, which is a precursor to the D7nnn series. It has the larger, heavier body, with dual control wheels, built-in autofocus motor for my old "D" lens, and it has the much larger and brighter pentaprism viewfinder as opposed to the pentamirror system on the D5nnn.
The D300 is an old camera, but I am really enjoying it. There are features that I miss that are commonplace on current cameras, like video (I think the D300 has it, but I have not found it yet), and when I think of my D300 combined with my D5300, I see a nice D7100.