Nikonian72 wrote:
The D600 is FX format, so cropping is not a factor (I am envious!]. Maximum aperture of 105-mm f/2.8 is bright enough for both macro focusing and sports panning (although I would prefer a zoom lens for this). Most studios use 85-mm lenses for formal FX portraiture, but if your room is long enough, you can push back with a 105-mm lens.
You cannot go wrong with a Nikkor 105D or 105G.