Recommend me a carrier.

[HotI]

Another vote for the Ergo. Love the Close Carrier for newborns but then the Ergo is great and lasts for ages.

[~Kim~]

I think the main difference is that the Becos come in prints/pretty fabric, whereas Ergo doesn't and with a Beco you can do a front facing carry if you so desire. Becos are also harder to come by.
There's also the Manduca
Beetlebums do a half buckle soft structured carrier (SSC) which is a buckle waist and mei tei straps - more adjustable than a full buckle SSC
Bobo do a SSC.

[Bloom]

One thing to be aware of with the full buckle carriers, is that you need to be flexible enough to do up the strap clip at the top of your back (i.e. near your shoulder blades). I just couldn't reach the straps well enough to do them up. I'm not horribly inflexible, just didn't seem to work for me. So I think you need to try it on in person before buying one.

I have a mei tai that I bought 2nd hand on ebay.