I want to buy a S&W revolver. I have looked & looked for a while now and I think I have narrowed down my choices but could use some "real" advice please. I was looking for a .357 mag. that is small in size, and easy to carry & conceal. It looks like the following models fit the bill but I'm not sure which one to go for as they all seem very similar. Could you give me your advice? A. S&W 60 .357 Mag. 2 1/8" stainless steel B. S&W 640 .357 Mag. 2 1/8" satin stainless C. S&W 686 .357 Mag. 2.5"