Not bad, Doug, although there are no dragons or other planes in your  configuration--both seem rather necessary.
What if we went by tiers? What would Heroic, Paragon, and Epic look  like? (And yeah, I know those are 4E-specific, but each edition has an  equivalent level range...the idea being what those tiers exemplify).
Heroic would involve the PCs making a name for themselves. Adventures  would be local, the setting ruined keeps and dungeons as well as  wilderness locations. The primary foes would be humanoids, standard  minor dungeon denizens, and some undead.
Paragon would involve the Underdark, drow, illithids, giants, etc. A  foray into the Astral Sea and other planes might occur towards the  second half, with the PCs becoming embroiled in a githyanki war. Some  major undead villain would be faced: A vampire, lich, and/or death  knight.
Epic would focus on either empire-building and world-saving. First the  PCs would carve out their own kingdom, slaying a dragon to do so. Then  they would have to save the world from an extra-planar invasion,  eventually facing Orcus, Demogorgon, Asmodeus, or Tiamat.
But that is just a rough sketch. In some ways, what I am looking for is what a campaign would look like if it were the only D&D campaign you would ever run again and you wanted to get your fill of everything good about D&D, as well as show someone else the "best of" the game.