Just to give you a word of warning. Going back and revisiting dungeons does not give you the experience it appears that you are looking for.
The biggest issue I found while going through the dungeons is the fact that abilities and skills shift and become available in a rather interesting way.
First, you need to keep in mind that you want to setup your macros and ability bar to reflect abilities available at level.
Then, and this is the part that is one that I tend to have issues with, is that you need to select your cross class abilities based on priority as you level. Lower level dungeons give you far less abilities than level 50, but, your cross class abilities are not level limited. That means, you can use, for example, Raise, Protect, or Stoneskin before White Mage can. These requirements change with the Party really. Typically I go with Bloodbath, and Awareness (I believe) for low level, and after 30~40 I have Cure and Raise in there somewhere, and the last ability I add is Protect. But that really is just for me (Solo).
And be forwarned, if you thought that tanks not marking was bad, wait until you have DDs that attack anything that moves, and pull... Or party members just running in random directions...