You might look at the 'LadySmith' models, 60LS and 65LS, I think.
If you really want a small .38 snubbie, the 637 or 642 may be ideal. They are also still around at the 'sale' price (My dealer has them for $339/$349.). At ~15 oz, they still bounce pretty well with 125gr +P ammo. I suggest the 158gr 'Cowboy' loads 0- at over 700 fps, they are good stoppers - and rapid follow ups are possible with the 637/642's.
Now, for more stopping power - do consider the .44 S&W Special. The best defensive round I have seen is the CCI Blazer 200gr Gold Dot JHP. From my 2.5" barreled 296, they hit ~800 fps, which increases to 870fps in the 4" barrel of my 629 Mountain Gun. The light 296, weighing only 21 oz loaded with five of the Blazer rounds, has an abrupt but controllable recoil. Certainly easier to use than the 125gr +P .38 rounds - or any .357 magnum rounds - from a snubbie. The 396 is the only .44 S&W Special offered now - and it is pricey (~$580-$600). A larger grip - especially one which covers that big hump on the 296 - is nice for me.
For personal protection, I don't feel that much difference exists between 5, 6, or 7 shots. Shot placement is critical - or you need something belt fed and crew-served. Whatever you obtain - practice!
Stainz