Good advice here... I love all the Smiths discussed. And I really enjoy my 2.5" 66, even though fixed sights and a 3" tube are better design features for concealed carry.
But for those who yearn for a fixed sight .357 with 3" tube and ample size/weight... you don't have to wait for an elusive 3" 13 or 65 to come along. You can buy one of these brand new and they're mighty fine indeed!
Ruger GP-100 3" Barrel, Blue Steel, Fixed sights, .357 magnum (GPF-331)
Ruger GP-100 3" Barrel, Stainless, Fixed sights, .357 magnum (KGPF-331)
These guns are a tad heavier and bulkier than the K-frame 13's/65's. They compare almost identically in size and weight to a 3" 581/681 (L-frame), except the L-frame cylinders are just a touch beefier than the GP cylinders are (surprise?).
But these GP's are much more comfortable to shoot with heavier loads than a K-frame is and they will withstand a heck of a lot more heavy loads than a K-frame will put up with too. So if you're going to shoot a lot of heavy loads this might be a better option than the K's. (Of course, 3" K-s are a favorite of mine as well.)
But don't wait too long on these 3" GP's as they are disappearing and before long (if you can get them at all) Ruger will be including built-in locks with keys, whether you like it or not! Yuck!
I replaced the hammer and trigger return springs on my GP's with slightly reduced weight springs and now the actions are really very, very nice indeed!
Anyway, you can pick up one of these and shoot the heck out of it while you conduct your search for the perfect 13 or 65. Then you'll have the best of both worlds! (S&W and Ruger)