As far as using the gun to shoot anyone, I think I would retreat to my locked office, call the police, and only shoot if they were to kick in the office door knowing that I am in there.
Given that the Ruger 1022 Carbine is a bit underpowered I had my eye on one of these babies
FN PS90 5.7x28mm Civilian Legal Semi Auto - Military Photos
However, the ammo is very expensive (NATO 9mm pistol ammo). The gun fanatic forum had posts that felt that the civilian ammo was a bit light for combat and the military grade ammo is illegal.
The FN PS90 seems to have all the advantages of my easy to handle carbine, plus more powerful bullets and a nice 50 round clip.
My research indicated that the best home defense weapon for the average home owner is a small pump action shot gun with five or six round capacity and loaded with something like double 0 shot. They said that the average scared person cannot aim a pistol under pressure.
The other thing that the research uncovered that poured cold water on my rush to get a weapon was that if you have a gun you need to come to grips with the idea that you are making a potential commitment to living with the trauma of having killed someone, getting the crap sued out of you for shooting someone and possibly going to prison for the rest of your life if they don't buy the self defense justification. That is a sobering set of concepts.
I have ordered some temporary security devices just to give me a little piece of mind. The first one is a $40 battery operated motion detector with a noise and strobe light. It can just sit on the table or be mounted to the wall and you control it with a remote control.
I also ordered these two door stop alarms that will sound off when pressure is applied to them and also help to keep the door from being pushed open. The can be useful when sleeping in hotel rooms as well.
I would have liked to have a nice video to give to the police so I am looking into some CCD camera systems. Amazon had a nice one with 4 cameras, DVR and the ability to access it from the web.
I noticed the X10 home automation and security stuff that SamClem mentioned today. I worry that the typical installer will be an incompetent rip-off, so doing it myself seems like a better idea.
I ordered the book X10 home automation and security for dummies this morning to get a start on reading about it.
Being a programmer I like the idea of being able to write a program to control the devices myself. I would also like to be able to do something with the cameras to be able to record the video on my PC, but to then copy the video data up to the web cloud (either to Amazon storage or to my web server at work). That way if they take the PC I still have the pictures. The other choice would be to build some sort of bomb shelter to hold the security computers.
I am also using my digital camera to take a much more extensive set of pictures of everything I own. For example I am snapping all of my music CD's (which I am told are a prime item to steal) and will make a spreadsheet with the inventory to cut down on the trouble dealing with the insurance company if I have to file a claim.
Thanks to everyone for all of the kind words and sympathy for my situation. It really helps to know that others have gone through the same situation.