Hi Marshall
Not sure what your main subjects with your macro photography are going to be. Insects in flight sounds (and is!) tricky. My experience (with a Nikon 801 35 mm camera initially, and now with a Nikon D100) has been with the Tamron SP 90 (1:1 life size - a superb lens in my opinion), and more recently the Nikon 105 (I know not compatible with your set up).
The Tamron is excellent for flowers, fungi, insects, as well as being a great portrait lens. I've had mine for nearly 15 years and still marvel at it. Excellent value for money. Not sure if you can still buy it in manual form though (mine is).
The extra 'reach' of a lens, say 180mm, can be helpful and extend the distance between you and the subject, but even with insects, a quiet approach with a 90mm Tamron brought very satisfying results. Not sure if a 180mm would be like for eg flower photography.
Kevin
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