Bard and Scholar are pretty decent healers. Scholars have Item Lore innate ability for good single healing and Bards get a group healing ability with one of their harps. They also get a harp that does a full party protect and one for haste as well. The Evoker also gets a good healing ability with the Ifrit white summon, though it's random.

Of course there is always the Red Mage with a Knight's support.