I would also nominate
Boards of Canada
Even if they have not been here as long as most of the previously mentionned artists, they have pretty much added a whole new meaning to electronica. Their really relaxed style that seems like a dream is super intelligent with all sorts of sounds moving everywhere. The duo from Scotland is also what appeals to this group. They are two person living in a very remote place, their music gives a whole new feeling that is rarely given in a track. I'd recommend Geogaddi and Music as a right to children.