There are a few in the city. I have seen three silver ones and just a few weeks ago spotted a black 2004 Vanquish with the new Driving Dynamics improvements (I still like the old rims better).
The Vanquish S is a very nice car, however, I don't particularly enjoy the gearbox. Also, I think that the DB9 has much more refined lines, and...wait for it...an improved gearbox.