Picture from Nikon.com
Exept for the ugly plastic covered barrel you don’t have a reason to not buy this lens (unless you want its big brother 85/1,4 AF).
It is biting sharp, lightweight, small, fast and cheap.
One of the Nikon legends.
Rating: 
Tag: review
Review: Nikon 70-180mm f/4-5,6 Micro AF D IF ED
Big and heavy, but beautiful.
You may obtain very crisp images from this lens, but you have to put it on a rock-solid tripod (or shoot whit a lot of light at high speeds), maybe interlocking something between the tripod mount and the lens itself to avoid vibrations (often a rollfilm plastic case filled with something is good enough).
It could be a useful travel companion, but for my tastes is too dark, so I use it mainly for landscape and macro work.
It is sharp wide open, and past two stops down don’t improve so much.
Rating: 
Review: Sigma 10-20mm f/4-5,6 DC HSM AF
(Will not work on full frame, on DX equivalent to a 15-30mm)
A very good performer indeed, if you don’t care about it’s border sharpness (only so-so).
If you need it as a reportage lens buy it and you will not regret your money; if you want it to use as a landscape lens try to test it before you buy to see if it met your expectations.
Full size:
100% crop:
For infrared use it is a “mixed bag” lens: really really sharp in the middle of the frame, but often with the borders not up to my standards and, only sometimes not everytime, a big hotspot in the middle.
Again: if you can try it before you buy it.
Rating: 
visible light
Rating: infrared
Review: Nikon 105mm f/4 Micro Ai
Amazing for macro shots, but damn ugly and soft for distant subjects like landscapes.
Good for portraits, but it is too slow for my tastes.
Others reports a much better behaviour for distance shots, so maybe is the eternal lottery of sample variation.
Tested only on digital.
Rating: close up
Rating: distant