This is the build I've been toying around with - the standard setup uses Enigma. This one puts out significantly more damage vs. immunes but you lose some survivability and LAEK so you will have to drink a pot to top up occasionally.
Helm: Griffon’s eye + 5/5 Lightning Facet
Amulet: 2 Sorceress Skills / 30 Strength / 60 Life / 90 Mana / 20 All Resistances / 25% Magic Find
Weapon: +3 Lightning skills / +3 Lightning / +3 Lightning Mastery / +3 Energy Shield / 20 FCR / 80 Mana / 2 Socket Orb + 2x 5/5 Lightning Facet
Armor: 4 Socket / 100 Life Archon Plate + 4x 5/5 Lightning Facet
Shield: Spirit Monarch
Gloves: Upped Magefist
Belt: Arachnid Mesh
Boots: 30 FRW / 10 FHR / 60 mana / 40 Fire Resist / +5% Max Mana / 10% Mana Regen
Ring: Stone of Jordan
Ring: Stone Of Jordan
Weapon Switch: Call to Arms Crystal Sword
Shield Switch: Spirit Monarch
Inventory:
Annihilus
Hellfire Torch
9x 45 Life Lightning Grand Charm
10x 5 All Resistances / 20 Life Small Charm
Merc Helm: Ethereal Andariel’s Visage + 40 ED / 15 IAS Jewel
Merc Armor: Ethereal Bugged Treachery Sacred Armor
Merc weapon: Ethereal Infinity Giant Thresher