Another style is Systema. It is a Russian system used by their SF fellows. Mostly using the opponent's weight and movement against them. It really reminds me of another branch on the Krav Maga tree.

Still and all, I want you to remember that the first step is mental. You must decide that there is no other course of action (Including Running Like Hell), then you have to commit 100%. I was taught that once the fight starts, you are dead. It is then up to you to fight your way back to life. It isn't pleasant, and you will get hurt even if you wind up winning. The other disadvantage is over confidence. I have seen the most mature, level headed folks leave unarmed self defense class and get their butt whipped that night in a bar after 1 beer and 1 bad decision too many.

I am 5'9" and was 200 lbs. when I tusseled with my old MP partner's wife. Turns out she is a jailer for a larger metropolitan police department. Little munchkin of a woman kicked my butt all over their backyard and rubbed my nose in mud after I just wouldn't quit taunting her to wrestle. Pain and Compliance took on a whole new feel that night.