Quinn, Jill and Bella are the best paths i say.
Sage has already proven that she too will use underhanded tactics to get what she wants. Pretty much holding the guitar hostage to make the MC do her dirty work. As well as being to easy to get in the sack, seems pretty self entitled as well. Although she says her parents are emotionally cut off, and it has made her the same. She certainly does seem to have a need to get her own way. Not a big fan of the Sage path.
DPC should switch Quinn over to being one of the Main Girls in the story, it makes it much more interesting.
Quinn may seem dark, but i see her turning to the light. Quinn i am sure knows Maya and Josy are in a relationship, It is Tommy that used her to torture maya, and cause conflict between Maya and Josy to keep her out of his fun.
And hey DPC is making enough cash, he certainly needs to speed up the development process if he expects 20 chapters. I don't see a lot of players waiting 6 years for an ending.