Better locks, concrete construction with metal door jambs, finished off with ADT and several .357s throughout the home, .12 in the bedroom next to the AR, etc.... ASP baton, Pepper Spray, and some form of firearm in the vehicle as well.
Funny, you have to be about batsh!t crazy to break into someones home, knowing they are home. This being the case there is no chance that anyone breaking into my home be it teenage girl with a tire iron or hardened adult male criminal will not leave alive if I have anything to say about it.
If you aren't prepared to kill, to destroy another's life and possibly wreck another family, then don't own a gun for home defense. Buy good locks, an alarm system and hope a lot. Just remember that the POLICE will NEVER be there to PREVENT your house being robbed or your wife/girlfriend from being raped... They'll show up just in time to tag a toe, call the Aid car, and just add you to a pile of unsolved cases nobody is interested in.
Home invasions are a sad fact of life nowadays, it's not a question of whether or not you are paranoid, it's a matter of whether you are paranoid enough.