A 9mm is a man/woman stopper. With todays ammunition, the 9mm is a premier choice. I shoot 147grain Winchester Ranger T and the penetration and expansion are awesome. I also have two .45acp, one Ruger and the other Kimber, that caliber has a stellar reputation. I also have a .44 special, .380 Bersa, .357sig, and a few others. The 9mm, .40 and .45 all have ball ammo that, well used to be, inexpensive to target shoot with. Concealment, normally there are more 9mm concealment pistol models available. Too much gun? Never an issue when you or yours life depends on it.