Judo.
Worried about standup? Judo starts standing up.
Worried about groundwork? Judo has groundwork.
Worried about live-training? Judo trains live.
Worried about joint locks? Judo has joint locks. Hell, they have chokes as well.
I've trained in TaeKwonDo, Wing Tsun Kuen, Judo, and Muay Thai; none of them well, but the point is, I've seen people that can do it well and to be honest, any of them can defend themselves well. Really frighteningly well, in fact.
(So in another words, if you find a good instructor regardless of style, you'll be able to defend yourself - yes, Hapkido included - but I'm attempting to hijack your thread like every-farging-one else here [btw, as a style Hapkido is cool, but make sure you like the place before you sign up], so bear with me)
But Judo is the only style where you can shoot fireballs out your ass, your $*#& grows 3x its size, and all women grovel in your magnificent presence (not really).