Carriers?

[lalicopa]

Ok, so I have a Hug-a-Bub that I used with Lily and I also have an old Baby Trekker that I probably won't use too much (very cumbersome) and I have an Ergo from when Lily was about a year old...AND I'm ordering a mei tai from the very talented Holly at www.meitaicarriers.com. My question is, am I missing anything I must have? Is the Maya very similar to the Hug-a-Bub? Do I need more than these? I survived just fine with the Hug-a-Bub and Trekker with Lily, and then got the Ergo, although it was a little late for her with that and I'm sure I'll get a ton more use out of it this time around.

Input appreciated. Thanks mommas.