What do you want to use it for? For a newborn? For newborn til 2 or 3 or just for the first few months? Is it important to have more than one position (eg, facing out, or on back)? How important is looks? Will it just be you wearing it, or will your partner wear it too?

Keep in mind that if you like the Ergo, you'll need an infant insert for it. You won't need an insert for something like the Pikkolo, but that has its pros and cons depending on your body size I'm finding. Those two are both SSC's (soft structured carriers). There are also Mei Tais (my personal fave), Ring Slings, Pouches, Wraps (like the Hug-a-bub, and you can also get firmer ones).

If you find you're not getting enough answers/info, maybe post a link to this thread in the Babywearing section, to catch the attention of more people who already use baby carriers.