I've never used an Ergo, and I did consider a Boba or a Beco, but haven't tried them either. We went with the mei tai because it's so easily adjustable- I don't have to worry about moving the buckles etc, when DH wants to wear her. We tried a WAHM mei tai before the BH, and I already liked it-- but I -LOVE- the babyhawk. The padding on the straps is fantastic, and it's really easy to get her on to my back now, which is a must if I want to get anything done. I liked wearing her in a wrap, but it takes too long to get the wrap on before I can pick her up- so usually my that time she had melted down and it was all for moot. With the BH, I just have to tie on the waist, and then can pick he rup again right away, so she's ok with waiting that long. We ended up splurging and buying new too and I love the print we went with (which is why we bought new, I couldn't find a neutral print I liked anywhere used).
I hear you guys on the hair loss. My happened to coincide exactly with my switching from a natural shampoo to a mainstream shampoo, so when after a few days I was pulling out clumps of hair, I frantically switched back to the natural stuff... no use. lol. I was hoping it would stop once I did.
Speaking of hair- I went and got a haircut last night, and it feels sooo much nicer. I end up throwing it up in a ponytail all the time, so I needed to get my bangs cut, and some layers, so that even in a pony, it still looked like I had "done" something. Now we're going to dye it at home tomorrow (didn't want to chance doing that at the salon with Tenley there, home is easier since we have some flexibility).