I'm chiming in to second Watchmen, especially if you've got easy access to it.
There is an amazing amount of thought put into its structure, in everything from its parallell storylines to the Fearful Symmetry-chapter, which has page-layouts that mirror each other; the first page and the last page have identical panel-shapes (though the content is different), the second page and the second-to-last page have identical panel-shapes, etc., etc., And so on through the entire chapter.