to correct the poll all 6 series guns are stainless and 5 series guns are blue.
I have a 586,686,624,36,19 and 29. I love my smiths they shoot well and unlike the colts (even though I love my diamondback and big daddy p) are more customizable to my needs.
I would go with the 586 DCM bad to the bone gun, and the full under lug doesnt beat you up with full power .357 mag loads.
depending on use, i have 686's in 3 21/2, and 4 inch . one or duty carry, one for conceled off duty carry. really tjho i prefer the stainless model 629 in 3 1/2 and 4 inch magnum for oyh. bes stopping power tha i have found.