just my two cents but pointing your gun at someone who is taking property outside of your home is really hard to justify shooting them over. this is just me but i would call the police right away, describe how the intruder looks, what he's wearing, and i would stay inside, property can always be replaced, your life cannot, why would you escalate a potentially dangerous situation when you are safe?
and this 69 cent plant thing should not even be a freaking question, thats just scary disturbing people would shoot someone over that, a firearm is suppose to be the last resort, not the only one.
edit: and if the intruder was inside, I would ask them to get down on the ground with their hands being visible, if they did anything but that, well then thats justified, they are inside your home and there are no barriers between you and the robber.