I recently got one of the Kahr PM40 pistols. It is an excellent carry gun, accurate, light, compact, and comfortable to shoot. I would highly recomend them to anyone looking for a concealed carry gun. It also comes in 9m and 45 acp, but I think the 40 is probably your best all around caliber. Size and power is about at its optimum mix in the 40 cal.
www.kahr.com