I had my mum as well as my H and she was fab. In the end I had to go to theatre and only one person was allowed in so H cam in and my mum missed the actual birth!
It obviously depends on the relationship you have with the other person but for me,my mum was the best, she is calm, strong, etc. I was in labour a long time as it didn't progress. sam arrived 56 hours after my waters broke so I had the induction drip 36 hours after my waters broke.,
However, my second labour was really quick - about 5 hours from beginning to end and J arrived 10 mins after my waters were broken. So, I was fine with just H.
Aurora, a hitcher, is a doula (although she's on holiday so won't reply to the thread) but when she was a student doula she charged much less.That could be an option for you. Have you checked out the doula website?
Good Luck!