Oh don't start me on baby carriers, I love them!
I have about 8 left over from my son and have just bought a second stretchy wrap (like Moby, think it might be a Boba one) and a Manduca ssc.
The Manduca you can apparently use from birth as it has a newborn insert thingy.
Last time I started off with an Ellaroo mei tai but it was a bit hard to position so fancied something else. Then I had a Yamo ssc which is good for small babies until about four months or so - don't think they make them any more. Then I had some random cheap mei tais, an Ocah one, an Ergo for DH, an Olives and Applesauce ssc (which was great up to about 18 months), and another I can't quite recall.
I seem to get on better with sscs and mei tais than wraps, but wanted to give a stretchy a go for the newborn stage this time. My goal is to use them on the school run a lot rather than drag the pram out every time. Will probably still use the pram when I have to go into town and need to take a big bag.