DoM
Conjurer->
White Mage: Healer (Conjurer/Arcanist)
?

Thaumaturge->
Black Mage: DD (Thaumaturge/Archer)
Red Mage: Support/DD (Thaumaturge/Conjurer)

Arcanist->
Summoner: Support/DD (Arcanist/Thaumaturge)
Scholar: Support/Healer (Arcanist/Conjurer)


I'm not entirely sure what would be good ones for Lancer or White Mage. Any suggestions, comments, ideas?