A suggestion is using the older MF Micro-Nikkor 200 mm f/4. It has a very fast-rotating focusing collar that can be flicked into position by a finger tip, it is quite light weight, long enough of build to be be easily supported and operated by hand, and has internal focusing so its physical length does not change. Image quality isn't at the stellar level of the best Micro-Nikkors, but provided you don't stop down too much, should be more than satisfactory. There is some CA though, but digital processing easily removes most of it.
If you add a flash bracket, you have a very handy helper for capturing your insects.
I agree with Erik's evaluation. The posted images by the AFS 105 Micro in this thread really show less than top quality. VR is a feature that cuts both ways and in my opinion., never should be relied upon for close-ups.