I own a
PM9 (same as the CM9 but with a few more features),
LCR, and a
637 J-Frame. I've not had the pleasure of shooting a LC9. With that being said, any of your choices would certainly suffice. Personal preference, semi vs. revolver, would be the major decision maker for me. I prefer a magazine reload over a speed loader/strip. I'm not sure I would let my decision be influenced on current ammo availability.....it will pass....and I assume you intend to keep this handgun fora while. Buying a specific model now, based mostly on ammo availability, is not a good reason, IMO.