Hellobee Boards

Find a local lending library and see what you like. If you find any super amazing deals... Go for it. Worst case, you resell it.

Your Beco is much nicer than a bjorn or an infantino, I wouldn't waste the money on them. They have terrible resale value (I gave my bjorn away because I couldn't sell it for $10!)
The ergo is a decent deal, but I don't know how different it'll be from your Beco I way prefer my Tula to my Beco (I sold this one actually), but it's slightly different than he ergo (I can still confirtably wear my 22 month old in the Tula but he has outgrown the ergo and def the Beco).

If the infantino is the mei tai and not the structured carrier, it's the only thing different than what you already have. These are usually fairly cheap.

As previously stated, your beco is way better than what you are seeing for sale.

I don't think you need anything else really.

I HATE my Bjorn and Infantino. It is the main reason I never wore my daughter. I just got an Ergo and a Moby and am hoping one of these will be better. Honestly, IMO, skip the Bjorn and Infantino.

I have the Moby, ergo and beco soleil. I ergo is mostly for my DH. I heard it's better for larger frames. I'm petite and I heard the beco is good for smaller frames.