My answer is probably not going to help you and is only my opinion. In essence it is how you train not really what style you train in. In talking about streetfighting I gather you are talking about defending yourself on the street? You need to find some one who has an understanding( and trains this understanding) of prefight psychology, awareness, pressure testing of techniques. This is just to begin with. You need to find out a bit about yourself, what sort of fighting suits your body type, then cross train in some other styles to pick up other techniques. If you are looking for something that will turn you into an invincible streetfighter, to dispell all your fears, then I'll save you some money and tell you that no system will do such a thing.