Judo, for sure. It'll give at least soem ground training, and lots of throws and clinch work. If you can control throwing and clinchign aspects of fighting you can control a fight as that's the bridge between the ground and standing. Might want to look int some boxing too.
Member of DaJoGen MMA school under Dave Hagen and Team Chaos fight team under Denver Mangiyatan and Chris Toquero, ran out of Zanshin Martial Arts in Salem Oregon: http://www.zanshinarts.org/Home.aspx