I took a handgun class yesterday using a 9mm Bersa. Fun! They recommended I try a Glock 19. My quick searches make me think this is a good recommendation, so I'll go try one (and maybe end up buying one!) But, ammo - there are different brands of 9mm. How big a difference does is make which brand you use? are some brands better in some guns? I am too new at this to get into minute details, but if I am buying off the shelf I might as well pick what's appropriate. What experiences/info do you all have?