One question I found very telling that wasn't in the above posts is "What do you require of your clients?".
I found some were telling me I had to have a certain type of pool, # of ultrasounds, certain childbirth class, certain pre-natal tests, etc. These were all HB MWs that has very similar answers to the questions on this thread. Really helped me figure out who would listen to what I wanted and who wanted to push their beliefs on me.