A CCL, with the training needed, and a carry weapon that you always, and I mean always, have with you is a good first step.
A real gun nut isn't the guy with 30 guns in a cabinet, a real gun nut is the guy with one gun, who practices every week, and takes that gun with him, even in the bathroom...
Next - the webcam, that records somewhere offsite (no SD card to steal, information persists, even if the camera doesn't...).
Next, your 80lb dog needs a pal to play with. I once owned an Irish Wolfhound - she was a wonderful dog, gentle with the kids, playful with other dogs, and faster than anything I've ever seen (bred to hunt by running down game, she was faster than any other dog)...she would let my 5 year old tug on her ears, and my 10 year old lie on her...but when someone she didn't know came to the house, watch out!
Our house had a door with a half window in it...She was right there, front paws above the doorframe (you read that right...above the doorframe) and 140 lbs of dog and teeth right in the face of the person at the door....barking and growling...when up on her hind legs, she looked me in the eye, and I'm over 6'...
First time the UPS guy came to the house, he ran, and I had to convince the poor guy that his life wasn't in danger before he would get out of his truck...other folks had similar experiences...
But if you get one, and they are the greatest dogs, be kind, take the wolfhound out to run every day...
http://en.wikipedia.org/wiki/Irish_Wolfhound