If You Liked Style Wars I recommend
These other three films
Infamy---about tagging bombing different tagging crews good film.
Bomb It---also about tagging bombing and crews. Has some early history as well. Has some stuff from the 70's and some female taggers. Just saw this yesterday.
This also shows tagging in Japan, Brazil, Germany, Africa, and the USA.
Just for Kicks-- About sneakers and hip pop. I have not seen this film but according to IMDB its a documentary looking at sneakers and how they were used in the 1970's. I am going to check this film out.
Let me know if you guys have any more suggestions.