E.M.
I have used several. The Sleepy Wrap is great. It's like the Maya but it's made out of stretchier material. I jokingly call it "Baby Origami" because it's a big long piece of fabric that you wrap and tie to make the carrier. Don't be afraid- it comes with great directions. I liked this one because it goes over both shoulders.
When they're really small, I use the "New Native Carrier" quite a bit. It's best for when they're infants and not yet sitting up. My son wasn't always crazy about it, but my daughter loved it.
Good luck!