TKD is useless. I'm not even an expert and know that. Take anything but. Those pretty kicks will get you nowhere.

Strongly consider Judo, which I've become a huge fan of recently. It has just as much of a ground game as BJJ, but this fact is very little-known. The only thing is that there are no leg-locks in judo competition, but they do practice them, along with chokes and arm submissions. Plus it has throws, which are great pseudo-takedowns for submissions and ground and pound.