Thanks for the comments guys. I really appreciate it.
+1 on the gun safe, I'm moving myself and my valuables to a friend's place for the next couple of days, in the event that these guys were gangbangers, and their bigger, dumber, "brothers" come to regain their "honor". I hope they weren't, but I just don't know, since all I saw was an arm and a hand.
Also, I'm going to be picking up a handgun on Monday, and my friend and I will sign up for the soonest CCW course we can find.
I am just extremely thankful for AZ law, and the freedoms we can enjoy here. Reading that story about that woman in CA who was shot while on the phone with 911 just the other day makes me so thankful that this whole thing ended the way it did, since there's really no way to predict an outcome with these things, and that I live in a state that doesn't try and restrict the basic human right of self defense. I think it is very possible that had I been unarmed, I wouldn't be around anymore...