The last pistol, which I haven't purchased yet, will be an MA-homologated Kahr PM9 for those times when you want to slip the pistol into your pocket while you walk the dog.
As any owner of a Model 639 can tell you, I use my iron for driving nails, boat anchor and SD. The 639 can be used with or without bullets for self-defense as the 639 weighs about 80 lbs.