I voted for the S&W Model 10 (which should include the older 1905 Hand Ejector series that proceeded it)
To me the key words are "service revolver." The Model 10 has fixed sights which won't get busted if the gun is dropped or otherwise abused. In a gun of this size and weight I'm willing to accept the .38 Special cartridge. Larger revolvers like Ruger's fine GP-100 will handle unlimited numbers of .357 rounds, but they are much heavier to carry around - especially with a full-underlug barrel. Same can be said about the S&W 586/686 revolvers. In a compromise between size, weight, reliability, relative power and plain ruggedness the Model 10 is hard too beat. It's also not too big for concealed carry if that becomes necessary.