Want to know what would be good for self-defense? Use basic professional wrestling moves! A lot -- if not most -- of it is based off of forms of martial arts, anyways. Need an instructional video? Buy Smackdown Vs. Raw: 2008 for PS2/3, Xbox 360, or the Wii, go to "Create a Move-Set" with a technical superstar, and look through the Quick Grapple moves. Most of the moves follow the same idea: take down your opponent in a fast, efficient way. A lot of the moves don't even try to hide that they were taken from martial arts, since some are named, for example, "Judo arm wringer takedown". (or something like that)
I am not even joking with how handy that video game has become for me. I primarily learn the moves for training towards actual professional wrestling, but a lot of the quick grapples really have come in handy in fights. I even took down my brother, who weighs one-hundred pounds more than me. But don't even bother learning most of the strong grapples, as for one they get exaggerated in the game (a lot of them are too dangerous in the real world or at least need to be done with more precaution than they show in the game), and you could honestly kill people with a lot of them -- that is, if you could hit them. You'd either have to be really strong to overpower them that much, or catch them off guard.
They also have strikes (as in punches/kicks and what not) from martial arts in the games, and a few are also efficient enough to actually use in self-defense. Games only like twenty bucks by now; it'd seriously be worth checking out.