My absolute favorite was a moby wrap/sleepy wrap (same thing, different brands). There is a learning curve to start using it, but once you get it down, it's great! And as the baby gets older, you can start facing him outward so he can see the world, he'll love it. You can look at youtube to see how to wrap it.
It's really just a long piece of stretchy fabric, so you can easily make on by buying a piece of fabric and cutting it lengthwise, and you'll have 2 of them. I used remnant fabric from JoAnns made 2 for about $10. Google "no-sew baby wrap".
I also liked the ring sling because it was easier to get on and off, but I never felt like it was really hands-free. And a moby, wrapped well, is competely hands-free.
Another tip - I found out what I liked by finding a baby-wearing group in my area. Try googling to find out if there is one. The one in my area had a lending library, and I met them, they showed me how they all worked and I tried on all the different kinds of carriers. I decided to try out 2 of them for a month with my baby, then I returned the loaners and bought the one I liked best (the fabric for the moby).