My grandfather taught me several rules for life
First: Shotguns for food. Handguns for when you can't carry a rifle. A rifle is, well a rifle its a rifle do your part and it will do its.
2nd: Keep it simple. Not a lot of clutter.
3rd: Enough is never enough.
SO by what my grandfather Rules:
You have a lot what some might consider enough Hope you have got a lot of 45acp and 9mm, because you have a lot of different guns that feed the 2, plus having to keep up with the magazines and maintenance. Do you keep ENOUGH mags with ammo loaded IN THEM for the Shit hits the fan senario. Now really think about it. (See Rule 3.)
You have a lot of clutter 9mm 45 40 cal 22LR 556 7.62 .38 Do you have the space to keep all that ammo in sufficent quantities. Can you get to it quickly and easily and employ it easily without, Without having to load the mag THEN load the gun. (See Rule 2 KEEP IT SIMPLE.)
Finally Shotgun will kill the food. Hope you can shoot slugs for the bigger game (Deer). Do you carry the pistols regularly and instantly be able to know where your point of aim is for each and EVERY one. Think about that one. The rifles WELL See Rule 1.
Now for the breakdown.
Stick to one caliber (just pick the one you and wife BOTH like) for the handguns look at what caliber the LE's use and if you like then stick with it (40 cal dept issued there you go). Then buy a lot of Mags or speedloaders(Revolvers) and I MEAN A LOT. Keep the shot gun just keep it Ready to go. Remember the zombie senario shoot them in the head. are you THAT GOOD A SHOT.