I take kyokushin, i love it, minus the bruises and pain. Keep an eye out for kyokushin schools that broke off from the main kyokushin organisations. Heres a small list of kyokushin offshoots that are similar.
World Oyama Karate
Ashihara Karate
Enhsin Karate
Keep in mind many people break from the above and dont carry the name over, since I am assuming the name is licensed to the organisation (though my sensei does mention it in his bio and details section of his site). So you will find names like, for example, "insert name here" dojo karate-do. My school has my senseis last name, followed by dojo karate-do. He joins up with other kyokushin/oyama karate schools that also broke off of their main organisations to meet up and fight. So try looking more in depth into the info and details of a school that doesnt list its "style or organisation". Schools usually freely mentions names like shotokan, goju, muay thia since no one (i'm assuming) can trademark the name.
Kajukenbo is cool too, strangely, that was my second choice (either that or kenpo). But the Kajukenbo was more then double the price of my school. You'll notice full contact knockdown karate doesnt charge as much as others, i always speculated it was because of the hardcore training and pain involved makes it less appealing to the general public, so they try to make it attractive by keeping fees low. What i pay is a steal, and he trains hardcore like old kyokushin of japan, so keep that in mind if you are still interested in kyokushin.
I found this with a quick search:
CALIFORNIA
Shihan John Lehner
Shihan Mary Lehner
Definetly try it out first. I dont know the rules of posting links and info for dojos, i am not affiliated with oyama karate, but if i broke a rule i apologize.