IMO, Birthing From Within and Birthworks are the 2 best CE courses out there, because they really emphasize that each woman knows how best to birth her baby, and instead of only concentrating on breathing and positioning, they focus on building women's trust in themselves, their bodies.
I haven't taken either of these classes, but know instructors of each and I actually have friends who teach Bradley and Lamaze, but emphasize women's birth empowerment.
Congratulations to you for choosing to make a difference to so many women.
I'll add that the 2 things I wish I'd done to better prepare for my son's birth (a great homebirth, btw) are take yoga and actually do the art exercises in BFW. Well, make it 3, I also wish I'd done a belly cast - and gotten a sling before he was born. Yikes- I'll stop now before I reevaluate too much!