The 686 is a fantastic revolver, as its blued cousin, the 586. It's built on the slightly larger "L" frame, so it can digest a steady diet of .357 mag. A bit heavier than the Model 19, but not much. And yes, they are in fact readily available, in many configurations. Just set the "caliber" filter to ".357 magnum" and the "frame size" to medium (K/L):
http://www.smith-wesson.com/revolvers
The double action pull on mine is probably about ten pounds, which is really pretty darn good. The single action pull is a very crisp two pounds. I'll go so far as to say it's the best trigger on any of my handguns.