I've worried about this type of thing for a while now. I've been burglarized before, but not at our new house and each time was just riffling through our cars, nothing big. So recently I asked my neighbor about what he would do.
My neighbor is an Iraq veteran, Green Beret, and a higher ranking (can't remember and won't post his actual title) police officer. My initial plans have always been to run and get him. But he told me some sobering realities on home invasion:
1) Its almost always related to drugs. Drugs, drug money, drug weapons, etc.
2) His first and most important weapon in the house is his cell phone.
3) In the event of a home invasion; he would call 911, gather his family together behind a locked door, and only threaten an intruder if they were trying to get to him through that door.
4) Most people who are shot during a home invasion are the occupants loved ones.
Me - If someone was on my property, inside or out, I'd take a similar approach sans me being behind a locked door. Wife would be locked away with our dogs. I would go out, confront intruder and let them know the cops are coming. If they attack me, I'd try to string it out until the cops arrive to witness it. Simple as that. I'm a big target and can put up a fight. I'd be exceptionally loud too. You see, I could not live with myself if I shot a kid or got locked in a legal battle in which the scum-bag wins. But I'll gladly take a beating in order for them to get locked up. Knife or bullet wound? Not excited about it, but stand by my plan.
Wife might not agree to all of that though...