I've posted this here before, but no one noticed, I guess.
12+3+1 Deadly Arts
8-11 Critical Strikes
9-11 Dagger Mastery
Shadow Arts - leftovers
Assassin's Promise {E}
Black Spider Strike
Horns of the Ox/Death Blossom/Nine Tail Strike
Impale
Signet of Toxic Shock
Dark Escape
Feigned Neutrality
Optional - Shadow Walk, Dash, Exposed Defenses, etc.
When I first posted, TF was your dual attack by default for deep wound. TF is no longer necessary, so that frees up your options on a dual attack.
Assassin's Promise will recharge all your skills, which is funny when fighting with an enemy MM in the area. You can literally keep up the equivalent of 300 armor and 7 regen on.
If FN and DE aren't your style, try using Shadow Walk, Dash, and Shadow of Haste. It might not be as fun since the nerf, but the almost infinite amount of teleports will confuse any mob.