Yes. I have heard good things about 300mm f/4 and am contemplating getting one.
Currently I use Sigma 150-500mm for longer focal lengths. This was the only one I could afford.
Does fine job, when lighting is good. That deer picture was taken with Sigma 150-500 on my D300.
Other than this I have all other Nikkor's 12-24mm, 105mm VR, 18-200mm VR, 70-300mm VR, 60mm Micro AF-D etc.