S&W K-frames!
In general, I'll say a .38 SPL S&W K-frame with "Gripper" model Pachmayrs. Pencil-barrelled 67s come to mind.
However, I recently bought what appears to be a 1962-made Model 14-2 with a 4" barrel. The trigger pull is light and teflon-smooth. It's the best shooting S&W I've ever held. The thing is so dead-on accurate that it's startling.
Among the semi-autos, Makarovs feel just right to me.