1e: fighter, ranger, paladin, magic-user, illusionist, cleric, druid, thief, assassin, monk (10)
2e: fighter, ranger, paladin, mage, specialist, cleric, druid, specialty priest, thief, bard (10)
3e: fighter, ranger, paladin, barbarian, wizard, sorcerer, cleric, druid, rogue, bard, monk (11)
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The Typical D&D experience has been ~10 classes (barring OD&D and BD&D) so I can't see less than 9, personally.
My guesses:
Fighter (kills knight & warblade, takes his stuff)
Cleric (kills healer, THS)
Wizard
Rogue (kills swashbuckler & spellthief, THS)
Sorcerer (kills warlock, THS)
Ranger (kills scout, THS)
Barbarian
Warlord (kills bard and marshal, THS)
Shaman (kills dragon shaman and druid, THS)
Prestige Classes: Paladin/Blackguard, Monk, Bard, Assassin