RE: Opinion on sidearm caliber.
I have shot many different sidearms in my life and this is what I think would be best for you. If you are not interested in hunting with the weapon go with a .357 or a .44 They are both big enough to knock an animal around if the need arises. If you want something where you can get alot of shots off in a hurry, go with the S&W 40 cal. The 40 has power and you can get a 10, 15, 17 round magazine. I personally carry a .357 or a 40.