Exotic Armor Guide

Based on data from a reddit post, here is all the exotic armor along with recommendations in bold:

Warlocks:

• Voidwalker
• Grenadier: Skull of Dire Ahamkara helmet
• Hand Cannon, Axion Bolt: Voidfang Vestments chest
• Sunsinger
• Fusion Rifle: Heart of the Praxic Fire chest
• Melee, shotgun, Solar Flare: Sun Breakers gauntlets
• Either subclass
• Melee, front line combat: Apotheosis Veil helmet
• Melee, support oriented: Light Beyond Nemesis
• Ranged: The Stag helmet (gtdroptop)
• Melee, shotgun: Claws of Ahamkara helmet

 Hunters:

• Gunslinger
• Grenadier: Achlyophage Symbiote helmet (o DeadEye o,  gtdroptop)
• Fusion Rifle or Sniper: Young Ahamkara's Spine gauntlets
• Bladedancer
• Melee, front line combat:  Mask of the Third Man helmet (o DeadEye o,  OmniscientDeath)
• Fusion Rifle, Arcbolt: Lucky Raspberry chest
• Either subclass
• Grenadier: ATS/8 Arachnid helmet
• Ranged: Knucklehead Radar helmet
• Special weapon, support oriented: Crest of the Alpha Lupi chest (OmniscientDeath)
• Fusion Rifle, Heavy weapon: Starfire Protocol chest
• Sniper: Don't Touch Me gauntlets (gtdroptop)
• Machine Gun: Radiant Dance Machines boots

Titans:

• Striker
• Melee, grenadier: An Insurmountable Skullfort helmet
• Melee, Fist of Havoc: Helm of Inmost Light helmet (CoolerSopranos2)
• Heavy weapons: Mk. 44 Stand Asides boots
• Defender
• Melee: Helm of Saint-14 helmet (PvP)
• Melee, support oriented: The Glasshouse helmet (Beer4Porter)
• Melee, shotgun: No Backup Plans gauntlets
• Either subclass
• Auto Rifle, support oriented: Crest of Alpha Lupi chest (CoolerSopranos2, Beer4Porter)
• Ranged, special and heavy weapons: The Armamentarium chest (gtdroptop)
• Ranged, special and heavy weapons: Ruin Wings gauntlets