I bought mine back in late 2000 with about 1,600 miles on it. It now has 51,000. That's maybe 7k miles a year. Not bad I guess.
Finally! I'm "above average" in something!
Get the bike. You know you want one and the benefits associated therewith. Considering another Duc? BMW?
Another option is the Suzuki Bandit 1250S. Beautiful bike. Very comfortable and lots of power. If I hadn't just put all that work into my Katana, I'd seriously consider trading it in on one. I love 'em.