I find that Sword+Pistol does a large amount of damage. At level 60 with 20 Domination, 20 Duelist and 10 Illusions, I feel like I'm doing a fair amount of damage. The Asura aoe condition abilties in combination with the Signet that increases condition damage. The trait that makes illusion crits to cause bleeding also works well with it (especially since Phantasmal Duelist hits 8 times each).

I find that the Shatter skills aren't that good. I just use them to finish off low hp junk mobs or if the illusions would die to aoe anyways.