The PM-9 is great, if it fits your hand, and if you don't want to swap grip stocks out. All the Kahrs are accurate, and usually very dependable, after 200-300 rounds.
I prefer the all-steel models (MK and K series) because I like CT laser grips on a short-barreled self-defense type gun, but that's just my particular preference. I have owned the PM-9 and the P-45, and both are outstanding carry guns. I currently have a K-9 with laser grips, and it is my favorite, of the three I have owned.