Personally, I'd like to see Classes made into "alternate-jobs"

[Chiramu]

While I would love to have a true DPS Marauder...

Berserker at level 30 from the Marauder class. I would like a weapon switch for berserker personally, like dual wielding axes or something like that. From the start of the Warrior quest, Berserker seems most natural to be an off shoot of Marauder.