I would second the schools that have already been mentioned, here are some that may not have been, but would also make good choices.
In Britain I would recommend: The University of Sheffield (the city is home of Warp Records)
The US : Renseller Polytech -in New York San Francisco Conservatoire of Music - has a little electronic department (I am bias because I'm friend's with Alden Jenks) UC Santa Cruz Electronic Music Studios - I am a slug alumni , offers a minor in electronic music and David Z. sometimes guest lectures.
Though not technically a school there is the center on Haight Ashbury called Robotspeak that offers some electronic music clinics -more for dance music