The 586-3 is the most desirable iteration of the entire line. It succeeds the issues with the "M" stamp correction and precedes the "drill & tap" for scope mounting or the MIM hammer introduction. It has the improved yoke retention design.
I purchased my 586-3 for $500, but it had areas of speckled rusting on the frame and cylinder. I sent it to S&W for a refinish as well as a master revolver action job for about $450. The trigger is as good as it can get. I'm a shooter who collects nice looking guns.