The Pachmyer grips are exponentially more practical than wood, especially if shooting stouter ammo. That 13-2 is from a time when most serious shooters tossed the wood and went to rubber. S&W's fixed sights don't work well for my eyes, but I also don't like the full lug barrels and the extra hole in the 686.
With the finish wear, you can't mess up that 13, and frankly, if I bought it, it would get some custom sights (XS Big Dot comes to mind, with some added on fixed rear with a big U notch); a rounded butt, and maybe some tougher finish like electroless nickel. Not a good fiscal choice, but appealing.
My M66 was worked on in the custom shop about 20 years ago (gold bead Patridge, action job, etc) and round butted by BMCM. I probably have $500 or so in it, so I don't need another similar platform for 2X the money. When I carry a revolver, it is usually that.