I'd like to set a story on the Philadelphia Main Line, but I'm not sure which community (Wayne, Berwyn, Bryn Mawr, etc.) would be the best mix of the old money/living in mansions class and regular folk. There needs to be a coed high school/prep school (or boys and girls schools close together) where some lower-class or lower-middle-class kids could hang out with the rich kids. Maybe by getting scholarships/sponsorships to the expensive schools or by having local places/pastimes where they would hang out together.
If anyone is from the area or knows the area and could recommend which town to focus on, I'd appreciate it.