What striking martial art compliments Judo the best in your opinion?

If it's about self defense, I would recommend Wing Chun since it's a very straight forward and practical system. There's no wasted motion in it and gets right to the point. It incorporates rapid-style counter punching, arm trapping, kicks, kick blocks, joint locks, sweeps, and the average self defense techniques such as groin shots, eye gouging, fish hooking, and head ing.