Tai Chi is harder than it looks.
If it's the combat version, that is.

I will here parrot the usual advice from the martial arts forums: go to some sample classes and have a go. Do the one you enjoy the most. I assume you've listed those schools because they're the ones you can attend.

I've been engaged in kung fu-lishness for five years and I'm still enjoying it. I did karate for about a year and a half before that, and there may be grappling depending on the school.

Those Shi Kon chaps look like they know what they're doing from the website, but it's hard to tell unless you're there.

Tai chi is usually taught badly and most good practitioners seem to have moved into it from another martial art. Sparring with a good tai chi practitioner is like trying to punch a slippery rock. That keeps hitting you. With an iron bar.

As commonly taught, judo is fairly modern and grappling based; it's the sport-friendly version of jujutsu. Jujutsu has strikes, throws, locks, and weapons in some schools. Weapons are fun. I like weapons. Jujutsu was invented by the samurai for killing people; judo was developed in the late nineteenth century to bring all of the disparate threads of jujutsu together and make it easier to practise without killing people. Either of these two will probably get you fitter faster.
(ThomsonsPier consumes, Mon 12 Jul 2010, 12:14, Reply)