Nikon lenses opinion needed?

Already have a Nikon 35-135ED AF and a 70-300ED AF and a Micro Nikkor 60AF. Open to suggestions regarding rounding out my lens bank. Shoot people mostly in the studio but sometimes indoors and landscapes.

Depends on what body. On dx even a simple 18-55 will already be a revelation. On fx for portrait a fast 85 or 105 would be interesting

For your stated purposes, you should look at the Nikon 24-70 f/2.8 lens. It would be great for studio work. An alternate might be the newer AF-S 50mm f/1.4. Although it may not seem too different from your 60mm at first glance, that f/1.4 can really help you control the background for portrait work. Either of these lenses would be nice on Amy Nikon camera, but if you happen to have a full frame body, get the 85mm instead of the 50mm.