Effective Martial Arts?

I agree with the guy above me. Brazilian Jiu Jitsu is very fun to learn, and use. Its mostly for ground game. But with the popularity of UFC a lot of gyms teach both BJJ and Muay Thai in the same class. Muay Thai is Thai Kickboxing. So I'd say Jiu Jitsu is one to look into and you could also learn some Muay Thai while learning BJJ