Another polite request to end the chest thumping. This is a long, but good, thread. A 4" .38spc revolver is the epitome of a classic handgun. There are tons of options, honestly probably more used than new.
In honor of that "epitome of a classic handgun," the colt official police and smith pre model 10 are the classic founders of this genre. For decades they were the gold standard. A post war Smith gets the nod from me for being a solid choice. Rugged and reliable enough for service use, accurate enough for target use, holsters and accessories made by virtually everyone. The pencil barrel post war, with the drop safety upgrade, is where my money lies on one of the best 4" .38s. There are more modern, and possibly even marginally better, options. But if we are considering modern options, we may as well consider a LCR in .327.