Commonality of ammo and silent kill
I agree with horselips last post. One concern that no one has mentioned is commonality of ammo. 22LR, 5.56, 7.62x39, 7.62x51, 9mm, 40, 45, 12gauge, seem to be the most common and least expensive. If you are counting on a firearm with a less common caliber then you're less likely to obtain or share ammo for your firearm. I would also add two more things: an AR-7 for your caches and a good bow with associated accessories for silent hunting.