Try attending the Boston Baby Wearers group.
www.bostonbabywearers.com
They meet once a month in Somerville. They do a quick overview of all the carriers and that's when you set your eye on one or a few that you want to try and the leader you want to consult with. All volunteers. Try a few out right there, see which one you feel comfortable with. The leaders help fit you and teach you how to check yourself too. Check the carrier out for a month for a deposit that you get back when you return it the following month (or you can send it back via mail to one of the leaders). You can also do this right after your peanut is born, and that will help if your peanut is especially small or nice and chunky, etc.
I have a mei tai that has a beautiful pattern... but my lo was/is too small for it; a stretchy wrap worked better for the first 6 months, now we do a beco butterfly, it seems more narrow for my peanut of a daughter.
I really liked this group, I checked out 3 in 3 months and finally settled on the wrap.
Good luck and congratulations!