I like using the same ammo as the LEO/Military because it is always likely to be available, but you can pick anything you like, as long as you feel you can justify it and obtain it. You will not likely find a box of .41 Magnum ammo in your Wal-Mart or with a buddy willing to trade, but you will see .45 ACP and .40, and maybe even .44 Mag. If you have enough to last you, then that might be a good choice.
Terminally, .40 S&W is a significantly better choice than 9x19, at the expense of mag capacity. Having said that, current ammo prices make 9mm a good choice for practice, since you can get 9mm Ball for just over $200/M, .40 is $300/M, and .45 ACP is around $375/M. While the military is still using 9mm, most civilian agencies are using .40 or .357 SIG. You pick what you want to use and think you can get.
Guys, do not necessarily confine yourself to the firearms categories I used. I just labeled them generically so that I could keep track. If you want one rifle and five pistols, that is your call, though I might like to know your rationale.
Seeing a lot of the same or similar selections is helping me reconsider or validate my choices.
Dozer, I like military weapons because I know them well and they tend to be reliable and durable. I can use an M1A to take a whitetail deer just as well as a civilian bolt gun, but the bolt rifle is not nearly as effective for the zombie apocalypse or a service rifle match. If you wanted a battery of Krieghoffs, Purdeys, and Perazzis, that would be your call. Seriously, what guns would you like to have, if anything?
Tom, I really thought hard about giving up my 686 for a .22LR, but practicality won out. Using your 19 in lieu of an autoloader would be your call. More powerful, but slower to reload, that would be your choice and I respect that.
Rick, my list might be even closer to yours if I had trigger time on those rifles. I can see you like LaRue's guns, and I would love to have your optics budget.
So far, I like the way you guys are thinking. Thanks for your input.
TR