> I am primarily interested in wildlife >photography sprinkled with landscapes and birding. > >Frankly, my inclination is to stay with the D7000,
I would listen to your own internal voice. The D600 is a wonderful camera, no argument. So is the D800. But when wildlife is mentioned, the concept of reach has to come into play. I chose to purchase the D600 using the rationalization that the difference in reach between a 12Mp sensor (D90) and 10Mp DX crop (D600) is not that great and that the quality of the pixels would help to level the playing field in any case. Still, when the coyote presented itself at 300 yards, I found myself wishing for a 24Mp DX sensor.
Full frame. D600, 70-300 VR @ 300mm, iso 200, 1/250, f/6.3 NEF, rendered from Lightroom at default settings using Adobe Standard, no other processing - in other words, what passes for SOOC at my house.