I also am happy with AMA. I do have perhaps a mis-guided view that it is an insurance policy as the main role. Just my view (no attacks on what goes on in my grey space please).
I also recognize it as the sanctioning body for my hobby similar to SCCA, AAU, and other organizations, that have guidlines that help people enjoy their hobby and make opportunity for members to compete. It is also a common thread to the hobby from coast to coast.