markd4life offers very good advice.
If you're not experienced with guns, your best bet is to keep an unloaded prop that looks like a gun, for the reasons he mentions.
If you are experienced with guns, then you have to honestly answer the question to yourself "under what circumstances would I shoot someone." If the answer is "if they entered my home and threatened me or my family," then honestly look at that scenario. You will likely be in your living room or your bedroom when (if) it happens. Where would you and the members of your family likely be at that time. How much time would you have to get and load your weapon, and which way would you be shooting.
When I work out this scenario for myself, my best choice is an unloaded shotgun near the bed.
Another strategy you might want to consider is deterrence. An NRA bumper sticker on your car and maybe a discrete little sign on the gate to your back yard "Gun control is being able to hit what you aim at." A potential home invader might see all this and go on to your neighbor with the Obama bumper sticker, feeling he'd rather face an unarmed homeowner than an armed one.
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