Power > Charisma. How much force of personality you have, how well you are able to project yourself and sway others.
Finesse > Intelligence. How fast your mind works, how well you learn new information and apply it in new ways.
Resistance > Wisdom. How much self-control you have, how well you are able to see through or otherwise resist both inner and outer influences.
Pretty straightforwards.
You could also go the Exalted route, and treat social abilities as a third category, giving you three physical stats (Str/Dex/Con), three mental (academic knowledge/common sense/observational skills), and three social (force of personality/ability to use words/outwards presentation)