Today I’d have to go with:

C) Sig P229 (w/ surefire G2) with 13 S&W.40cal 165gr. Federal Hydrashoks. It’s my all purpose bad-guy stopper.

I suspect most people with experience would agree that an AK is a really bad idea inside a house, as it is almost guaranteed to over-penetrate at that range and just cause a clean puncture that goes out the other side. You’re likely to NOT kill the bad-guy and end up killing someone in the neighbor’s house.

What you really want is to disperse all of the kinetic energy such that the bullet ends up just inside the skin on the far side of the would-be attacker, which is generally 12-16 inches if you account for clothing, and medium to large sized attackers. A .4x caliber handgun is pretty decent, ballistically speaking. There are also special rounds for close quarters combat, designed to be highly frangible (breaks up easily), but still have stopping power.

Shotguns are ideal for most indoor uses, as they tend to disperse easily without penetrating walls. They are much safer for cases where you want to reduce the potential for “collateral damage”. I am considering a shotgun (Mossberg 500 or the Benelli M4 Super 90) as the primary weapon for in-home defense.