Dwarves in Butcherblock. If you have any skill quad kiting, these are a breeze, and they make you boat loads of exp and money. I was pulling down a blue or more every quad with these guys, not to mention an average of 20pp or more per quad.
A good place to try it out is at the BB docks. Grab the two dwarves at the end of the docks, then there are two dwarves in the houses on the left. (if you're facing the ocean) If you just grab those, the other dwarves wont aggro, and even though my faction with (I think) Kaladim Citizens can't go any lower, I can still enter Kaladim just fine, use merchants, bank, etc. I'm told there are one or two dwarves in Kaladim that will aggro if you do this, but I've yet to find them.