I have had a great deal of success with this organizer. I recommend it for high school, although I even used it with seventh graders with success. It offers a break down of each aspect of the essay that the students need to include. It allows them to visually see what parts of their essay they have completed, and which parts they still need. It also offers reminders of what different concepts of the essay are, such as the TAG, topic sentence and the "So what?"
It is thorough, but you can add more specifics (such as a transition between the TAG+Synopsis and the subtopics), or take away some of the more specific details.