White Mage
Black Mage
Red Mage (hybrid Melee caster version)
Bard (party buffer)
Blue Mage (Maybe merged with beastmaster, has a "familiar" animal and they can learn spells from NMs and such? Or make it like the Morpher class from FFTA where they turn into a monster and then can use that monster's abilities)Summoner (obvious)
Dragoon (PLEASENOPETWYVERN)
Samurai (Damage dealer, not tank pl0x but otherwise I like it in FFXI, or a Parivir in FFTA2)
Paladin
Dark Knight
Ninja (Dual wield short swords! PLEASEDONTMAKETHEMATANK)
Monk (martial arts version, give them unique weapons!)
Thief (Dual wield daggers! And Steal!)
Chemist (for DoH/DoL! Mixes various materials to make various items)
Puppetmaster (About the only one I want ported from FFXI >.>)

But for the initial release of the job system...

Black Mage, White Mage, Red Mage, Bard for Disciples of Magic
Samurai, Ninja, Thief, Monk, Dragoon for Disciples of War
And Chemist for Disciples of Hand/Disciples of Land

The rest can be added later. These are just the ones I REALLY want to see.