I would recommend making either 3 or 4, and adding the other from the NPC pool.
My current party is:
Human Ranger(Stalker, rangers shouldn't wear heavy armor anyway!)
Dwarf Fighter/Cleric
Human Figher Dualed to Mage
Human Mage dualed to Thief
This way I can keep all the sub plots available, as well as keep some flexibility with the party.
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