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Let's look at every class:

Paladin: good idea as they have anti-disease powers and are reasonable fighters. (6)

Rangers: better. Dual Weld and anti-racial fighting can be useful in a game full of repetitive monsters. (7)

Mage: must! if not two (10)

Thief: Must.. but surely multi-classed? (8)

Cleric: Must healer but let's consider teh Druid:

Druid: faster level up, weaker fighting, allows elemental summoning early in game (9)

Fighter: this hack n slash game requires at least one (9)


So my party would go like this:

Thief/Mage
Mage
Druid
Fighter
Cleric/Paladin
Ranger