Well, AAMI is pretty well respected, so it could be an option. If you're wanting to do your apprenticeship right away with school (and it sounds like that is the way the school is organized), then there are various things to take into consideration:
What sort of midwives are in your area [the larger the variety to choose from, the better the chances of finding an apprenticeship that will fit]? Do they currently have apprentices? If so, how far away are the apprentices from going on their own? What do these midwives like to see from apprentices before taking them on [nothing, some school, some doula training, school nearly completed]? Do they pay their apprentices [some apprentices pay their preceptors, though I think this is rare. I pay my apprentice, but it's not much]? How many births a month do they do? Do they have specific prenatal days, or are they scheduled all through the week? Do they do appts in an office, or at their clients' homes [doing office appts are generally faster, as you can fit more clients in during a certain period of time at an office, whereas in-home visits require travel]?
Do you have relatives close by? A community of close friends? These two things SAVED me so much trouble - and still do. I love the fact that my friends and MIL are willing to help out on a moment's notice.
Still, it's really hard sometimes. It would break my heart to be at a two day birth, call home and hear my daughter crying in the background.
I think that if you're being called to be a midwife, you WILL be a midwife. Sometimes it's better to wait, while for others, they feel a stronger sense of wanting to get it done sooner. It's not like midwifery will go out of style or not have any need in even five years, ya know?