Don't forget the Ithaca 37 shotguns. Lack of ejection port makes them slightly more short/handy, they are unbelieveably simple and reliable, and the company's business difficulties have made some real cheap. If you shoot you want to contain the shot, bird shot will do tremendous damage at close range and not penetrate multiple layers of wall board reliably... and when times comes for your defense... I grabbed the first shells I came to, I guess I had them out for quail...
As suggested, and i forgot, these animals tend to run in packs. You will NOT, in all likelihood, face "one." As in the BS movies... And if you hit "it" and it goes down it will not lay there quietly... And on drugs... find a real combat vet if you can and ask... Some keep coming with parts shot away... And as suggested, if you fire the gun into the floor or ceiling before they enter, the cowards are likely to flee with dirty underwear... most are not looking for a fight, easy pickin's or leave/RUN...
Any cell phone, charged, is, supposedly able to call 911. 911 gets two or three calls or more they will go nuts and respond with police, fire... (don't talk to them, let them wonder...) more good guys the merrier if you have not shot someone, let them... badges (color of law) which you DO NOT have... Have a couple more for the family members who can reach them to hit speed dial 911...
If you want to play games (you better be a "cold" MF)... hit speed dial in front of the invader THEN toss the phone onto a couch or papers or
(soft, you don't want it to break)... 90% of the time, the invader will try to reach the phone to turn off the call, and while he/she/it has turned away you buttstroke the head neck/back/spine, etc... and kill them without firing... !!! Saves ammo...
And the courts, outside the most rural jurisdictions, will not be sympathetic. You are cheating them out of work. Why they could lock this clown(s) up for many years, counsel him/her/it, --[MAKE MONEY, LOTS!]... You kill him, oh well... And you might have "over reacted" ... You did think your life was in danger... silly person.. Ergo
If you have a pistol grip shotgun, well the persecuting attorney will argue to the jury that you are a blood thirsty animal who prepared for this day because you wanted to kill someone just to see what it feels like, cf Leopold and Lobe... And you stocked buckshot just to see the big holes and ... Read Ayoobs books, he covers it nicely...
Now if you (your attorney) can say, "I hunt birds"... (some, PETA and the like, will hate you immediately, anyway) and I heard this ruckus and I reached for my bird gun and it went off into the floor/ceiling while I was trying to load it with shells left over from
... and you let the "good guys" with badges shoot the rectal spinchters... a jury will be a whole lot more sympathetic... He was just trying to defend his family with his bird gun..." etc... Slobber, slobber... LUCK!!!