Since you are limiting yourself to S&W, I'd suggest that you also limit yourself to steel J or K-frame models manufactured before 1980. They carry very easily and can be shot all day without fatigue or failure. Since you are not interested in other brands I won't tell you how pleased I have been with a Taurus model 856 snubby 6-shot 38 special +P, or a Ruger LCR also in 38 special +P. The steel-framed Taurus has just the right weight to smooth out recoil for pleasant and controllable shooting. The LCR is super light-weight, which makes it nearly unnoticeable on your belt - however it will not be the best choice for a big box of Buffalo Bore fire-breathers. Both have been 100% reliable and carry comfortably. Buy one of each for the price of one new S&W.