I'd argue that Ella is just plain bad. She's good for nothing other than 0 pills, and the min 4 on her ability means that she often doesn't even DR to full capacity, and without her bonus she is ghastly. She'll rarely be much more than a liability.
Tsubame doesn't really do it for me. If you want a 5* FPC that isn't 450k, I'd use Yoshida.
I prefer Heitachi and Futoshi Ld over Fei.
I've had success with Chan, but Dao Wang and Kusuri are both good for different reasons.
I support wats_happenin's suggestion.