Stormfirst (Veteran Tempest Island, Undaunted Coffers):
Obvious choice since the Sorcerer's passive abilities buff Shock and Physical Damage by 5%. You can run Prior Thierric (Veteran Red Petal Bastion) alternatively - both work perfectly fine. Just make sure you get familiar with which skills proc Prior Thierric and which don't to get the placement down.
Storm-Cursed's Revenge (Shipwright's Regret):
I've been a fan of this set since day one. If you focus on shock damage, which the Sorcerer particularly excels at, the proc of this set just goes nuts.
Perfected False God's Devotion (Veteran Sunspire):
We just equip three pieces of this because we want the Minor Slayer buff. The 2-piece bonus is a nice side effect.
Remember that you can reconstruct Perfected False God's jewelry in gold quality by just paying the Transmute fee!
The Master's Perfected Lightning Staff (Veteran Dragonstar Arena):
Not only does this add another AoE spell to our quiver, it also boosts our spell damage by absurd amounts after casting Shock Clench. Try to cast this every four skills to keep the buff up.
The Maelstrom's Perfected Lightning Staff (Veteran Maelstrom Arena):
This buffs our Unstable Wall of Elements, is one of our best guarantees to constantly abuse the Exploiter CP and adds yet another shock spell to throw at foes. It also gives you flexibility regarding your back bar ultimate - Thunderous Rage or Summon Charged Atronach. Be careful with the latter though - especially in dungeons, the Charged Atronach is going to stun everything in immediate vicinity. Tanks will hate you if you drop this before everything is stacked.