I'd like to see some of FFXI's healing classes brought in...

Red Mage - Most variety & potency with enfeebling magic, some unique buffs, capable but weaker healing ability than WHM, & limited melee skill. Melee RDM can hate all they want, this has been my favorite mage job in any game to date.

Scholar - Access to all "base" black & white magic spells with the ability to specialize in the use of either.(eg Thunder IV but no Burst or Thundaga III) They also had spells to control personal weather element & such.