I started with the 18-55 and 55-200 kit as well, and upgraded to tha 16-85 and 70-300(which you already own). Though the 16-85 is not THAT better than the 18-105 (said by many users here), it's more expensive, better build, new VR generation, has a distance scale window. Never looked back, so far. If you have the money, this might be a good option.
Nikonians!!! My best investment made after my camera!!!