Righteous Crystal

Brighthelm of Justice:  Drops from Hydross the Unstable in Serpentshrine Caverns.
Pauldrons of the Argent Sentinel:  Drops from Morogrim Tidewalker in Serpentshrine Caverns.
Justicar Chestguard:  Paladin only.  The token for this drops from Magtheridon.  There are several other similar chest pieces that could be used by any plate wearer.
Gauntlets of the Righteous:  Dropped by Warchief Kargath Bladefist in Shattered Halls.
Girdle of Valorous Deeds:  Dropped by Aeonus in Heroic Black Morass.
Legplates of the Righteous:  Dropped by Aeonus in the Black Morass.
Boots of the Righteous Path:  Dropped by Warchief Kargath Bladefist in Heroic Shattered Halls.
Icy Cloak:  Crafted by Tailors.  There are a number of other cloaks with the same appearance.
Bloodmaw Magus Blade:  Dropped in Gruul's Lair.
Aldori Legacy Defender:  Dropped in Gruul's Lair.

Details here.

Sunward Lightbringer (Paladin only)

Lightbringer Faceguard Token to buy this drops from Archimonde in Hjyal Summit or you can buy Vengeful Gladiator's Lamellar Helm from Kezzik the Striker in Area 52 for 1000 Honor Points or get Crown of Empowered Fate from Essence of Anger in the Black Temple.
Lightbringer Pauldrons Token to buy this drops from Mother Sharaz in Black Temple or you can buy Vengeful Gladiator's Lamellar Shoulders from Kezzik the Striker in Area 52 for 750 Honor Points.
Heroes' Redemption Tunic >Drops from Archavon 10 or buy with Chestguard of the Lost Conqueror token that drops from Gluth in Naxx 10 or you can buy it in Dalaran.
Tabard of the Shattered Sun Requires Exalted with Shattered Sun Offensive
Heroes' Redemption Gloves> Drops from Archavon or buy with Gloves of the Lost Conqueror token, which drops from Satharion in the Obsidian Sanctum or you can buy the token in Dalaran.
Tainted Girdle of Mending > Drops from Patchwerk in Naxx 10
Heroes' Redemption Greaves:> Drops from Archavon 10 or buy with token that drops from Thadius in Nax 10.
Sabatons of Deathlike Gloom Drops from Gothik the Harvester in Naxx 10
The Willbreaker Drops from Keli'dan the Breaker in The Blood Furnace heroic
Sunward Crest Requires exalted with Shattered Sun Offensive

Details here.

Sun-Infused Sin'dorei

Circlet of Prophecy Priest Tier 1.  There are lookalikes--check Wowhead.
Flarecore Mantle Made by tailors.  Requires Thorium Brotherhood rep to buy the pattern.
Scarlet Sin'dorei Robes Drops in heroic Magister's Terrace.
Girdle of Ruination Made by tailors.  Pattern is a world drop.
Imperial Red Gloves Green BOE
Imperial Red Boots Green BOE
Perdition's Blade Drops in Molten Core.
Flametongue Seal Bought for Justice Points in Shattrath.

Alternate versions

Whitemend Hood Made by tailors.
Primal Mooncloth Shoulders Made by tailors.
Girdle of Prophecy Priest Tier 1
Sun-Infused Focus Staff Drops in Magister's Terrace.  The green BOE Frenzied Staff is another Blood Elf style staff.

Red Linen Sash Alliance only quest reward in Elwynn Forest.
Mantle of the Corrupted Drops in Naxx 25.
Lok'amir il Romathis Drops in Blackwing Lair.

All details here.

Hero's Acumen

Unfortunately, the Robes of Acumen are no longer obtainable.  I still have mine from a Maraudon run way back in Vanilla WOW.

Heroes' Shoulderpads of Faith Priest Tier 7.  Token Spaulders of the Lost Conqueror drops in Naxx 10.

Acumen Robes No longer available.  Used to be a quest reward from Maraudon.

Chillbane Belt Drops in Hour of Twilight.

Resplendent Bracelets Green BOE

Mystical Gloves Green BOE

Kurkenstoks Alliance-only quest reward on Azuremyst Isle.

Surgeon's Needle Dagger drops in heroic Pit of Saron.

Manual of the Nethermancer Drops in The Mechanar.  (Book of Blood and Stormbound Tome--both made by incription--have the same appearance.)

Alternate versions

Runecloth Shoulders Made by Tailors

Rod of the Sun King Mace drops in The Eye

Staff of Dominance Staff drops in Molten Core

All details here.