The 900 market is flooded with used bikes because a lot of people learned on the 900, and promptly traded it in on something bigger. OR, they learned on a 900, decided motorcycling wasn't for them, and turned around and sold it. It is EASY to get a very low miles, excellent condition Vulcan 900 with extras for around $5,000
My bike I bought for $5,000 out the door, it's an LT, it had 8,000 miles on it, and was in pristine condition. It was owned by an older gentleman who wanted to get back into riding, rode it for a couple of years, decided he really needed a trike, so he traded it for a Harley Tri-Glide.
Nothing wrong with new either, but just wanted you to be aware of how excellent the used market is on these bikes. If you want to buy new, as others have said, look into leftover models. My wife just got a 2011 Shadow 750 Aero for about $6800 OTD, and the MSRP I think is about $8500. Nothing changed between '11 and '12. It's a brand new bike, for it for almost 2 grand less than 'current'. Still has the same, full warranty. It's definitely the way to go unless the current model year just has something new you have to have. (Which, in the case of the 900, not really. There were some mild changes with the '13 lineup but, IMO, nothing worth paying extra for. Get a leftover '11 for thousands less, and instead of the new redesigned seat, spend the money on a custom made Russel and STILL be ahead)
Good luck!
-John