Uh, I'm kinda bothered that no one has mentioned this yet: If you get into a serious altercation with someone, you have a couple things to consider;
1) Are they REALLY going to be unarmed, or armed with nothing more than a knife? Especially if its a gangbanger, they'll most likely have at LEAST one gun. Time to bust out some old wisdom: "Never bring a knife to a gunfight."
2) If you get in a position where you truly fear for your life, are you going to be content being armed with only a 3" blade??? I dunno bout you, but I'd feel just a
little better with something more along the lines of a Beretta 92F.
Basically what I'm getting at, is that a knife REALISTICALLY, should only be used as an ABSOLUTE last resort for defense. Most people do not have the proper training to use a blade very effectively in close combat. Would you REALLY trust yourself to take someone out effectively with a
small blade? I wouldn't trust myself to do that with my Strider BT! Also, your assailant is most likely going to be more heavily armed. (Like I said, especially a gang member).
However, when you brandish a gun, you present a person with a whole new set of options. The assailant can;
a) Continue on their current course of action attempting to attack you (or whatever he wants to do) and go home dead or at least severely wounded.
b) He can drop to his hands and knees, kiss your feet and apologise for being so stupid, because hey, he was only kidding. He didn't really want your wallet or your wife. Then he can scurry back into the sewer from whence he came. Funny how a Beretta makes even the toughest, meanest criminal into your new best friend!
I too live in CA where you can't legally carry a blade over 3 or 4 inches, much less a gun. But I'd rather live to fight it in court rather than die on the street. If you are really that concerned for your safety, (hey, think about your wife/girlfriend too! She should be reason enough!) I highly recommend a handgun, and definitely some
good training to go along with that. You can keep your knife for a LAST RESORT backup, and as the first piece in your collection that you will be growing now that you are a member here!
Hope I helped!
Good luck!
drjones