Smith & Wesson Model 19, 2.5"
A little bigger than the J-frame, a little heavier, but more durable in the long run, and more controlable.
Others are mentioning the Ruger SP-101. Good gun, if you like the grips. I don't, so it's not an option for me.
Also, the Ruger trigger is, generally, much inferior to the S&W trigger, and the S&W trigger is much easier to smooth & reduce pull weight on than the Ruger.