PhotoArtsLA wrote:
The 70-200 f/2.8 Nikkor is one of Nikon's best, sharpest lenses with minimal distortion. Highly recommended.
That said, if you are going to concentrate on portraiture, the 85mm f/1.4 Nikkor is a spectacular portrait lens.
Also, if you care to manually focus, the Nikkor 50mm f/1.2 is astonishing.
I agree with Richard (above) on the 85mm 1.4. It puts you at a comfortable distance from your subject, and can create some spectacular "selective focus" when desired. I've never felt the need for a variable focal length lens for portraiture; it's just too easy to vary your camera-to-subject distance, making a "zoom" irrelevant.