Nendoroid Shinobu has been on my radar for a while, and looks to be a winner. Her more animated, post-Bakemonogatari form is perfect for Nendo-fication (disregarding a certain uncomfortable bathing scene).
The version at Miyazawa Model Expo is still unpainted, but she still has that melts-your-heart cuteness. This is one Kahotan preview I'm really looking forward to!
[via Hobby Search's Twitter]