Karate - Emphasis is on making carbon copy martial artists. 'Do what sensei tells you' is often the lingo. Mostly striking. You spend a lot of time doing kata/forms and most schools (unless they are kyokushin off shoots) use point style sparring, which isn't very good as a defensive art. Find a dojo that teaches full contact karate, it's your best bet.
Ninjutsu - :D UFC 2.
Aikido - A good friend of mine is a nidan/2nd degree in aikido. It's a spiritual art heavy influanced by shinto as the founder was a shinto priest. It takes a supper long time to get good at, it's not a very defensive art as all attacks are done in unrealistic ways. Mostly wrist locks, some shoulder locks.
Judo - A great fighting art and the father of BJJ, Meada who taught the Gracies' was a kodokan judoka. Judo IMO is better in the street where you have to be aggressive to fend off an attack. BJJ is better in the ring if you have the time... Judo is also everywhere. I rolled with a national Canadian champ last night and it was awesome. You can also use your judo in BJJ comps, I do. I fight in sambo and BJJ as well as judo and do fine. :P Throwing and grappling, better stand up then bjj.
TKD - McDojang. ITF TKD is a more defensive style then WTF but both are watered down verison of karate. Mostly kicks. See karate.
Hapkido - Some are very good, most are not. What I find is that TKD guys do a little judo and call it Hapkido. It's not the samething. If you can find a good hapkido school, great but most aren't worth the money.
Mauy Thai - Very hard on the body. It's one of they best stand up arts, period. But they abuse there bodies a lot, they also can't walk for a week after a fight.
May not be a good thing for ya. Striking arts.
Kung Fu - McKwan. So many people claim to teach hapkido and kung fu only have a very limited understanding of the art. Caution when looking for a school.