Martin, For me it's the used market. But you can buy both the Wildfire and the Dragonfly new these days from Colden Canoe
http://www.coldencanoe.com/.
Here in the Midwest we don't see alot of Hemlocks or Coldens. All the Dragonfly's I've ever seen were Curtis Canoes. Bell is out of business with respect to the manufacture of new Wildfires. Obviously there are still alot of Wildfires out there in the used market, and if I were in the market for that specific niche boat I don't think it would take me real long to find a Wildfire in pretty good condition (which is really what I'd need for a tripping boat anyways).
Since we don't see alot of Hemlocks here, I've only paddled one SRT and it wasn't under the conditions I might have considered using it. For me I don't really see the SRT and the Dragonfly as that similar. The SRT is longer and has somewhat less rocker than the Dragonfly. The Dragonfly was definitely designed for whitewater at the time, while the SRT is more a moving water canoe aimed at river tripping. Both are pretty narrow compared with the Osprey.
I would think that if you can paddle a Kestrel you're not going to find either the SRT or the Dragonfly that spooky with regard to initial stability. But I'm sure for alot of paddlers fishing and photography might be a challenge in all three boats.
PK