I could see a real classy, full size, automatic pistol, chambered in 9MM like a CZ 75 B as being a serviceable enough, and aesthetic enough weapon to be my one an only pistol, also with a Kadet conversion unit it'd be an economical choice as well. I dunno if the conversion unit would have any specific legalities attached to it in some countries or not, so it might be out of the question, even at that 9MM, while not necessarily cheap to shoot, is affordable.