What should I consider when determining if I want a midwife?

Different things. If you want to have your deliver at the hospital, midwives usually enjoy a back up support of obgyn physicians and do a great job as a whole. They seem to be more protective of their patients, which some patients like. They usually take more time and seem to have a more personal approach than physicians. Home deliveries done by midwives carry some risks, so if you are willing to accept - go for it.