I am thinking that, in some ways, the more the better but that is not the basis for this string.
Anyway, to the point.
1. 12ga shotgun that can handle slugs and shot which can be used for hunting or home defense.
2. A high-powered rifle (7mm or larger) for hunting.
3. 1 or 2 concealable 9mm pistols which can be used for non carry defense and/or conceal carry.
4. A .380 or .32 smaller than the 9mm pistol(s) in case the carry needs a smaller pistol.
5. 1 good accurate .22 caliber rifle for small game.