For pocket carry I'd suggest a S&W 642, Taurus M85UL; and similar light weight J-Frame sized pistols from S&W or Taurus. There are lots of options so concealed/shrouded/bobbed/exposed hammer is personal preference. Try to shoot a couple if you can and see if you're comfortable with 357 Mag in a gun that size & weight or if you'd prefer to stick with .38 Special.
If you're going to step up a bit in weight and carry IWB or OWB you can cheat up on size & weight without compromising ease of carry on the belt. In that case a S&W 2, 2.5, or 3 inch S&W K Frame will give you 6 rounds in mid frame gun that's very easy to shoot and still easy to carry. Alternately - keep in mind I'm a K Frame die hard here - the Ruger SP101 is an excellent choice. I've had a 3" 38 only SP101 for a few days and find that it's a good 'tweener' size. It's a little larger and more pleasant to shoot (for me) than a J Frame and is little friendlier than a K frame for IWB carry. The weight is nice for soaking up recoil, which also helps with the pleasant shooting. The trade off is that you lose a round to a K Frame, and (based on 357 Mag SPs that I've shot) the K Frames are more shootable with magnum loads.
Confused yet? Me too. That's why I have a 2.5" S&W M66 (357 Mag K Frame), a 3" SP101 because I found it for a good price, and am now waiting on a J Frame to pop up at the right price. Best of luck in your search and feel free to ask if there's anyhting else we can help with.