First, let me define hard style. So, most martial arts have a soft and hard version of practicing them. Soft style would be doing the minimal harm to get out of a situation; while hard style is maximizing harm to make sure you remain safe. So, soft style you'd toss some in an arm bar and then run away; while hard style you arm bar, dislocate at the elbow, maybe damage the shoulder, and then run away.
There's a difference behind the philosophy. Essentially, Hard style practitioners view maximizing harm to the assailant reduces their risk of receiving harm back. If you make sure the assaulter's arms are broken he's probably not going to get back up and chase you down. I don't want to get into a debate about self defense philosophy.
Krav Maga seems ideal. With a few huge caveats most schools are basically Tai Bo, and not the same martial art being taught to the Israeli Defense Force. Conditioning is great and all, but not what I'm looking for.
I'm mostly looking for umbrella organizations that would vouch for the quality of a school by membership. I have no interest in competing in a sport, and would prefer a style designed for real world combat. I believe those techniques would be more ideal when you don't have the limitations designed into the UFC in terms of strikes and holds. I do have experience in Kendo, Hapkido, Taekwondo, Karate, and Jujitsu; it has just been years since I practiced.
Which styles / schools are known for hard style philosophy in their training? How might I decipher whether a Krav Maga school is authentic Krav Maga or a fitness class?