Well, the 16-85 is a pricier lens - about $600 USD. The 18-105 is cheaper, at around $400. However, with the 16-85, I'd be less inclined to get a wider angle lens, which would set me back another $400-$500. So, in the end, the 16-85 solution would cost me $600, whereas the 18-105 and a wide angle could set me back $800-$900.
Now, what I don't know is whether the 16-85 is really quite wide enough for what I want... but I've never felt with my existing 18-55 that it needs to be too much wider, so maybe.
So many decisions....