definately street defense oriented stuff like krav maga, kali, jeet kun do, systema, cqc. i am currently a muay thai and bjj practioner , and i have to say both of those would be useful for self defense on the street, although the other ones that ive mentioned would be so much better. if i mount the guy for an arm bar, chances are his buddys gonna stab me from behind. 1 on 1 though, that would probably be in my favor. although you can clinch someone in MT and then keep the other attackers at bay. ive heard this from a few instructors, but ive never had the misfortune to actually use this technique yet. later on, i want to take more boxing, mt, bjj , but i also want atleast 2 years+ krav or kali experience under my belt- just so i can be a very, very well rounded martial artist. hopefully fight in a few vale tudo tournaments in the next few years too. whatever, its totally up to you, but im not too big a fan of karate, TKD, akido, and especially nin jitsu (way to many scammers for this one), though thats just my humble opinion.