This is a good list. I like the 15-22 as well. I love the CZ-75 but some folks might think of it as old school.For me;
1. Pistol- CZ75- It has been rock solid reliable, and I have a .22 Kadet kit for plinking and training the kids. Chews thru the absolute sh!ttiest ammo I could scrounge up.
2. Fighting rifle- My Colt M4 (AR15 6721). I have several different caliber uppers for it, plenty of mags, spare parts, and a decent optic. Light recoil, plenty of common use ammo.
3. Shotgun- Mossberg 500- I beefed mine up a little with a heavier 590A1 barrel and metal safety and trigger group. I can swap the 18" barrel with a 28" barrel should I need to hunt or shoot 5" alien saucers. I also have plenty of spare parts since the Mossberg is user serviceable and a very common gun. Mine has been very reliable, and is equipped with a light and laser.
4. .22lr- Smith and Wesson 15-22. I love them. Love them. A fantastic rifle for the money, easy to accessorize, take down, and clean. Mine have run absolute garbage .22lr ammo without choking. Lightweight, easy to suppress, eay to mount an optic on, lifetime warranty.
5. Extended range/hunting rifle- As much as I want to take my M39 I am sentimentally attached to, I'd probably take my Remington 700 in common .308 Winchester. Scoped, reasonably accurate, common so parts availability and gunsmith know how.