Weapon of choice for future DPS?

[Shurrikhan]

So Witch Hunter from that Warhammer MMO

That was the first thing to come to mind for me as well. I'd prefer a more traditional job or something wholly unique and lore-driven within XIV, or even particular to 5.0 or 6.0, etc., therein, but the concept for that job was decently enjoyable, so I've certainly nothing against it.