Of course the last sentence is the most important one ... I don't think there are many "AFS" macro lenses around
No Nikkors apart from those you mentioned ...
Let's see Sigma Products: the only HSM I see are the 150/2.8 and 180/2.8.
I think these are very good choices, though not cheap. I have no personal experiences with them, but among us - if I recall correctly - Piolo has the 180, and he's very pleased with it: he posted some picture here recently.
All in all I'd go for it (or the 150) if the "price is right" , compared with the Nikkor 105, of course ...