Maya Wrap if you are willing to have a learning curve - it is really the perfect infant carrier.
A pouch like the Kangaroo Korner is also great for popping baby in and out.
Pikkolo is ergonomic and hands-free, no learning curve.
We have all 3 and love them all for different reasons and uses! Probably use the Maya and Pikkolo most of all, both on a daily basis. We'll be using our Ergo starting at 6 months. I wouldn't get the Beco Butterfly given how similar it is to the Ergo.