i like what i've seen of krav-maga. The real-world super-serious training mentality seems legit.
I would love to find a qualified chin na instructor.
And on fundamentals: the best benefit i received from the training i encountered, was that it finally taught me how to move and use my body correctly and efficiently. Before i started having problems in the last few years and became completely inactive, i had unlimited stamina and a healthy dose of confidence. It's great to feel like superman. Actually, the mental benefits trump the physical benefits... but they're kinda linked. When body and mind flow in unison, remaining true to pure intent, you're almost unstoppable, in pretty much anything.