I'm a size 22 or so (depending) and I really love my Moby Wrap. I also have an Infantino Baby Bjorn clone which was great when my son was young. (Available at Target for $35 or so). Both fit me fine.
I did purchase a Kangaroo Korner Adjustable Fleece Pouch, but neither me nor my son liked it much. I'm going to keep it for the next young'un... who knows, s/he may like it better.
Oh, I also have an ERgo Carrier which we haven't begun using it. I'm on the cusp of needing the additional waist strap, so I purchased it anyway.