The Nikkor 60mm (about $550) has to be almost kissing the subject for max enlargement.
That sucks.
It blocks light for diamonds and scares away insects.
Buy the Nikon Micro-Nikkor Macro lens - 105 mm - F/2.8 - Nikon F (about $900) for this reason.
It can be much much further from the subject.
The specs say minimum focus distance is one foot but I think that is from the film plane to the point of focus.
Also get extension rings or a bellows for even greater enlargement.
Find out whether this new body is compatible with old Nikkor lenses.
If so buy an old 105mm Nikkor Micro like I have (about $200).
You do not want to use auto focus or vibration reduction (you'll be on a tripod) for macro work anyway.
Focusing distance increases with focal length, but the longer lenses intrude into that since I think they measure from the film plane not the front of the lens.
So you have to get your calculator out to determine working distance.
As a Nikon shooter, I love seeing these Nikon threads pop up. (Take some of that canon!)
Kenny brings up some good points. If you can afford the 105 VR, it's a pretty killer lens. I took all my Fred Miranda forum boards. usually have trustworthy people unloading their used gear. A lot more surety buying from there than fleabay.