Hey Chris,
Congratulations on the new camera! I have a D50 and I love it. I don't think you can go wrong investing in good glass! My husband surprised me with the Nikkor 105mm VR lens 2 years ago for Christmas and it makes amazing images. It is very spendy and had I been buying it I would have bought a Sigma or Tamron.
I would not go with the zoom for what you want to do. It sounds like a decent lens for the price but I think you may be frustrated with the aperture and focusing distance.
I have a good 50mm f 1.4 lens as well as the 105. The advantage of the 50 is that I can hand hold it without shake. The 105 is a brick and I have to use a tripod with it. I am not sure how heavy the Sigma 105 is but that may be a consideration if you are wanting to use it to do outdoor macro stuff where a tripod might be inconvenient to carry.
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