Attached Link: Review of Cosina/Vivitar 100mm macro lens

Here is a link with a review - it looks to be well worth the money from that, and other reviews I have seen.

One point to note is: It will not auto focus on your camera, you will always have to use manual focussing. Not necessarily a drawback with macro photography, but something I thought it worth you being aware of.  

You need to get one with a Nikon F mount then it will fit your camera.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html