I was toying with the sigima 70-200 Macro, but wanted to buy the best glass I could and also with the D700 and battery grip it helps to have weighty glass on the front of it.
The 105VR received some favourable reviews and and a couple of people I was talking to on another forum loved using them with their D300's so after much deliberation I decided on the 105.
It also takes some cracking portraits and you can use the Nikon Teleconverters with it. I have the 2X Tele and the VR and Autofocus both work with it, despite what Nikon say, though the AF is a bit iffy at times, but for Macro I only use MF and Liveview.
There are a few good reviews of the lens on the net too. Another one to consider might be the Nikkor 60mm which you can pick up for about Â£380.
The 70-200 is a brilliant lens though quite heavy and long!