hong said:Oh, come on. Raistlin is the prototypical epic-aspirations character!
Yeah, but nobody is allowed to overshadow Raistlin.

The Kingpriest and Fistandantilus are both epic aspiration characters too. A variant timeline mentioned in Sovereign Press' "Legends of Krynn" sourcebook has the Kingpriest succeed in his goals and become "The Godpriest". In another variant timeline Raistlin succeeded in his goals but destroyed all of existence.
I would say in Dragonlance that you can get to level 21, and become a god-king (Kingpriest) or Tharizdun-like elder evil (Raistlin) but there really isn't anything to do in the setting itself. Sure you might go planewalking between levels 21-30 killing off Krynn's pantheon one by one, but that's not really a Dragonlance campaign anymore.