In current production, with stainless steel (6xx series):
The 686 would be the big brother in .357 with its full underlug. However, it is an L-frame, meaning the grips would likely interchange with it's K-frame cousin (as long as both have the same style: round or square). Holsters would likely not interchange.
With out a full underlug (look at the pictures on Smith's website, note the "shroud" hiding the ejector rod), there is the 619 (fixed sights) and 620 (adjustable sights).
Smith's current production does not include K-frame .357's as they were originally designed to be carried (and rarely shot) with .357 and practiced with .38. A full diet of .357s has been known to take a toll on these models.
Current K-frame .38 production (in stainless) include the Model 64 (stainless version of the Model 10 --the classic .38 Military and Police) and Model 67.
If I have made any mistakes others will be along shortly to correct me.
I am a proud 686+ (-6) owner, though I would prefer a blued version.