To me, the currently available 2 1/8" 632 Pro makes more sense than buying a used 2" 631 for $600-$700+:
Mine was pricey - ~$648 OTD - new 9/11. It comes with fixed elevation (Drift adjustable windage.) tritium Night Sights front and rear. It sports some 60 Pro grips, extra cost ($43) from S&W Accessories. It'll chamber, fire, and extract .32 ACP, .32 S&W, .32 S&WL, .32 H&RM, and .327 Federal Magnum rounds. The elevation & windage on mine were set for coincident POA/POI from 7-10yd, using a 'combat' sight picture, with both Federal 100 gr SJHP and Speer 115gr GDJHP .327 Federal Magnum loads, which let you know you've fired something more energetic than a +P .38. The wood grips don't help the recoil, but they help the hand fit/feel... and they look pretty neat, too.
Stainz