So you are running out of sites to shoot? Or decides to skip your next vacation destinations due to budget constrain? Then, I would suggest to go macro (or micro as Nikon would call it), into the world of details.
I have been considering the notion of going micro for a while now and is currently evaluating the pros and cons of the Nikkor 60mm F/2.8D and Nikkor 60mm F/2.8 AF-S lenses. Both are brilliant lenses but are priced quite differently.
Some say the older lens is built with less distortion, while others claimed that the new nano coat can turn the tide of the macro war. I have not reached a conclusive summary yet but it sure ain't far away.
The AF-D model is sold for about $350 while the AF-S at $550.