Reputation For Enchanters

Good enchanting patterns are vital for any enchanter at level 70 and some can only be purchased when a certain level of reputation is reached with Outland factions. The following rep requirements are relevant to Alliance enchanters:

Honor Hold

• Friendly: Formula: Enchant Bracer - Superior Healing
  
• Revered: Formula: Enchant Chest - Exceptional Stats
  
• Exalted: Formula: Enchant Cloak - Subtlety
  

Cenarion Expedition

• Revered: Formula: Enchant Gloves - Spell Strike
• Exalted: Formula: Enchant Cloak - Stealth
  

Lower City

• Honored: Formula: Enchant Ring - Stats
  
• Exalted: Formula: Enchant Cloak - Dodge
  

The Consortium

• Friendly: Formula: Enchant Cloak - Spell Penetration
• Honored: Formula: Enchant Weapon - Major Striking
• Revered: Formula: Enchant Ring - Striking

The Sha'tar

• Honored: Formula: Enchant Gloves - Major Healing
  
• Revered: Formula: Enchant Weapon - Major Healing
  
• Exalted: Formula: Enchant Gloves - Threat
  

Shattered Sun Offensive

• Honored: Formula: Enchant Chest - Defense, Formula: Void Shatter
  

Personally, I would aim for Honor Hold (Revered), Cenarion Expedition (Exalted), Lower City (Honored / Exalted), The Consortium (Revered), The Sha'tar (Revered) and Shattered Sun Offensive (irrelevant, since exalted is hit within two weeks thanks to the well-paying dailies).