for my first I had a midwife, her assistant midwife, and my doula. I wouldn't have had it any other way. the doula was there with me all day, the mw got there about 4 hours before the birth, the assistant about 2 hours before.
for my second child the doula seemed extravagant (their rate out here is $800) since I was having my second homebirth and not really worried about the labor I only had the mw and her asst. that worked out fine also.