If you're set on a strung BJD in a 27 cm range I'd suggest looking into PlanetDoll's mini Riz. She's the right size range, and tends not to look too much like a little kid. (At least I'm assuming that you want a bit more of a mature look if you're thinking fishnets!)
I've never handled one personally, but In the photos she does seem like decent poser and doesn't look to gap easily.