My weapons are the same as they've been for ages: Blaster + Agoniser But if I'm choosing something from the Craftworld armory, can I just have a Prism Tank?
Ugh. I suppose I should go look at your armory. Singing Spear is the clear winner in melee, but I'm not familiar with your ranged weapons (aside from the Shuriken weaponry). My guess would be either the weapon of a Fire Dragon or a Ranger.
Melee weapon wise I would have to say Mirror Blades which is just a pair of Banshee Power Swords, Ranged weapon wise Shrunken Pistols/Rifles after all how can you beat a weapon that shoots mono molecular ammo and is shot using the Eldar psychic ability, much less of a chance of someone taking your gun and shooting you with it.