Many people on various websites suggest a M-1 carbine with soft-point bullets, because they will really damage a soft target compared to fmjs.
At 100 yards, typical rounds are often reported to have the same energy as a .357 bullet at the muzzle. How many civilian 'self-defense' shootings take place at over 50 yards? If less than 50, can't imagine the need for a {pricey} AR.
Are our houses soon to be like the "Road Warrior" movie's fuel depot scenario? Don't know about you, but we don't store fuel, and any unchecked paranoia only helps the gun and ammo scalper$....ye$, there are many out there, and maybe on some of these websites.
Depending upon your price limitations, the Mini-14 or SKS are handy.
The shorter so-called SKS "Paratrooper" is even handier than the standard SKS, but costs more. For price/value: an SKS.
There are reliable aftermarket mags for the Mini 14 or for the 30, if you do some research.
Lately, Ruger has sold some factory 20-rd. mags to the public for about $40, recent $10 price jump.