Well you know what they say about opinons...IMO Krav Maga, the offical H2H for of the Israeli (and now FBI, DEA, many law enforcement, and SpecOps groups) is the baddest of the bad.
As a fundenmental, it teaches engaging multiple assailants, improvised weapons, use of firearms and knives at advanced levels. In addition, it was developed with the intent of demobilizing or killing your opponent by hand. None of this candy-coated kata crap. It is a mix of Russian and Brazilian Samba (spelling?), Akito, Jiu Jitsu, and some other practical stuff.
NO fight is clean. I have had my ass kicked by guys half my size and have hospitalized multiple opponents twice my size. It all boils down to instinct, reaction, ability to issue sudden incapacitating violence, and determining within a nanosecond who is going to win the fight.
If its in a bar, chance are you aren't fighting for your life. If it's on the street, you are. You absolutely must kill your assailant without remorse. If you are constitutionally incabable of digesting the idea of killing someone with your hand, a fork, a pencil, a bottle, etc. - then the art may bot be for you.
They are some what limited in places of learning in the states, but now include DC, NY, Philly, LA and a few other places. I think
www.kravmaga.com is the official web site.
CF