This is easy. ANYTHING Dale Zentner. Tried for a Tessa all of 2012/13w/ no luck. When a doll is completed (full set) Dale emails interested buyers. First to respond has the option to purchase the doll.
Some examples of Dale's work:
Tessa in assorted face-ups, hair colors, fashions, and eye colors.
The new Cassie -
Dale Zentner's face-up on Dollstown collection