I'm leaning towards Dual Wielder. I usually take a tank approach to RPGs like Souls, so Dual Wielder seems like a great change of pace in a familiar style for me (focus on quick movement and fast attacks versus absorbing damage). Not only that, but the class looks badass. I'm theorizing that your character's effectiveness with two weapons will be determined by Dexterity, which means Dex may finally have a use after all.
What about SW? Who are you going to choose to begin with in Dark Souls 2?