S.F.
I used the nojo sling and the maya wrap; I LOVED them both. The nojo has padding that serves as a sorta rail, which made me feel better as a novice. As they got older the maya worked better.
However, I've moved to another carrier because my back was bothering me with the asymmetrical weight distribution of slings, and this one is by far the best. It is the ERGO Baby carrier. It is for older-than-infant kids, BUT it does have an infant insert:
http://www.ergobabycarriers.com/babycarriers/category/acc...
Good luck!