What did I fire? I fired a 22, a 40, a 357 magnum, a 9mm and a machine gun- yes, a machine gun. Will I be purchasing a gun? You betcha! Liked the smaller 22 for target shooting, although I was 6 for 6 with the revolver. At this point, I'm looking at the 40. But that machine gun was incredibly fun!!!
The .40 is a good choice. This forum is a great place for input on exactly what to get, depending on your application(s). I've been shopping for a lighter CCW peice lately, myself.