I'd carefully examine the Dan Wesson for condition. If it looked good, I'd buy it without a second thought. Taurus' quality has been spotty over the years.
One thing to beware of with Dan Wessons is that some have been used a lot for silhouette shooting with heavy loads and show some wear from heavy use. With a 6" barrel, the one you are considering is not likely to be such a gun.
On the other hand, if you have your heart set on a particular barrel length and configuration, you'll probably be happier in the long run buying what you want.