In the ever-evolving world of Azeroth, gearing up your character with the best-in-slot (BiS) items is crucial for maximizing your character's performance. Each class and role has specific gear that optimizes their abilities in various PvE scenarios. As WoW Cata Classic enters Phase 1, players are eager to outfit their avatars for the challenges ahead, and BiS gear often requires a significant amount of WoW Cata gold to obtain. Here's a comprehensive list and recommendation for the best gear sourced from dungeons, raids, and BoE craftables for various tank classes.
Protection Paladin Tank
For the stalwart defenders of the Light, Protection Paladin should seek out gear that bolsters their survivability and threat generation. Key Pieces include：
Head: 
Helm of the Forlorn Protector from Conclave of Wind in Throne of the Four Winds.
Chest: Earthen Warplate from Blacksmithing, offering a significant boost in armor and stamina.
Blood Death Knight Tank
Blood Death Knights, masters of sanguine protection, will focus on items that enhance their self-healing and damage mitigation.
Legs: 
Legguards of the Emerald Brood from Valiona and Theralion in The Bastion of Twilight.
Trinket: Symbiotic Worm from Magmaw in Blackwing Descent, which provides a substantial Mastery boost.
Feral Druid Tank
As natural guardians, Feral Druids should prioritize gear that enhances their agility and critical strike chance:
Shoulders: Mantle of the Forlorn Vanquisher from Cho'gall in The Bastion of Twilight.
Weapon: Mace of Acrid Death from Maloriak in Blackwing Descent for its high agility and stamina.
Protection Warrior
The indomitable Protection Warriors will want to secure gear that increases their block chance and stamina:
Shield: Akmin-Kurai, Dominion's Shield from Nefarian in Blackwing Descent.
Hands: Hardened Elementium Hauberk from Blacksmithing, providing a balance of defense and offense.
Retribution Paladin DPS
Retribution Paladins, wielding the Light's wrath, should aim for gear that boosts their critical strike and attack power:
Weapon: Reclaimed Ashkandi, Greatsword of the Brotherhood from Nefarian in Blackwing Descent.
Legs: Legplates of the Forlorn Conqueror from Halfus Wyrmbreaker in The Bastion of Twilight.
Unholy Death Knight DPS
Unholy Death Knights, summoners of the undead, will benefit from gear that amplifies their haste and strength.
Chest: Chestguard of the Forlorn Conqueror from Magmaw in Blackwing Descent.
Trinket: Essence of the Cyclone from Halfus Wyrmbreaker in The Bastion of Twilight for increased critical strike.
Elemental Shaman DPS
Elemental Shamans, channelers of the primal forces, should look for gear that enhances their spell power and haste:
Head: Crown of the Forlorn Protector from Al'Akir in Throne of the Four Winds.
Waist: Belt of the Blackhand from Nefarian in Blackwing Descent for its high intellect and critical strike.
Balance Druid DPS
Balance Druids, masters of astral magic, will prioritize gear that increases their spell power and hit rating:
Feet: Treads of the Forlorn Conqueror from the Conclave of Wind in Throne of the Four Winds.
Ring: Signet of the Fifth Circle from Cho'gall in The Bastion of Twilight.
Marksmanship Hunter DPS
Marksmanship Hunters, sharpshooters of the wilds, should aim for gear that boosts their agility and critical strike:
Chest: Dragonflayer Vest from Leatherworking, offering a significant increase in agility.
Legs: Wind Dancer's Legguards from Valor Points, providing a balance of agility and critical strike.
Arcane Mage DPS
Arcane Mages, weavers of enigmatic energies, will seek out gear that bolsters their spell power and mana efficiency:
Wrist: Bracers of the Bronze Flight from Halfus Wyrmbreaker in The Bastion of Twilight.
Off-hand: Book of Binding Will from Theralion and Valiona in The Bastion of Twilight for its high intellect.
Remember, the journey to acquiring these coveted items is fraught with peril, but the rewards are well worth the effort. If you don't have much time to get them, you can search for a third party to help you. Obtaining BiS gear often involves WoW Cataclysm boost services to reach the necessary level and content quickly. May fortune favor your endeavors in Azeroth!
Related Links:
WoW Cataclysm Classic Tier List Guide: DPS, Healer, and Tank Rankings