Ed Parker's American Kenpo Karate for about 17 years - I'm second degree black.
Also kickboxing, for about 10 years. Not pro or anything, but LOTS of sparing.
Some grappling, but most of that was learned from experience, not instruction.
So, to the main art, Kenpo - you ask why?
Well, as a kid, I took Tae Kwon Do and Shotokan classes (at separate times), and I'm just one of those people who refuses to accept the answer "because that's the way it's done."
Kenpo was the next art I found, and it provided me with the intelectual, mechanical and bio-physics (withing reason for a MA class) that I needed. It's also a beatuful blend of so many different fighting phillosphies.