J.K.
My daughter went to St. Andrews Nursery School in Audubon, on Egypt Rd. (across from the Shannondell golf club). She really liked it and she was well prepared for kindergarten. They emphasize learning thru play. They have 3 year and 4 year old programs as well as preK.
I know others that are happy with Trinity and Methacton Mennonite.
Good Luck!
Jen