In my case, there were only 2 to choose from. One is 2 hours away and is practicing illegally (assisted homebirth is illegal in my state). The other is 1 hour away, but has a birth house just over the state line that's 15 minutes from my house, and one of her assistants/apprentices (working on a CPM herself) lives the same distance from the birth house. The midwife practicing illegally is much cheaper ($1500 vs. ~$2500). Both midwives have good reviews via word of mouth (very important to me). But I chose to go with the one across the state line because a) I don't feel comfortable "causing" someone to break the law, and b) the distance issue is a huge factor for me since my family has fast labors (I followed in this tradition myself the first time by having a 2.5 hour labor).
Word of mouth is big on my list though. That's also how I found a "backup OB" for this pregnancy. Pretty much, in my area, many in the NCB community either use the midwife with the birth house or they use this OB in the hospital.
Also, I wanted a midwife that would do what *I* want (or not do what I don't want

) and that lets me make all the decisions. One thing I really like about her is that even on controversial issues (including circumcision, Vit. K, eye goop, GBS testing, GTT testing, etc.), she gives the facts of both sides, making sure I'm informed on the issue, and then lets me decide. While she might not do a certain procedure with her own children (and didn't - she has 4 kids), she doesn't require that you do or don't do a procedure. She just gives you the information and lets you make the decision yourself. I really like that about her.