Must Read Player's Handbook Every Player Should Read This Thoroughly
Optional Tome of Magic Wizards and Priests May Want to Read
  Arms and Equipment Guide  
  Castle Guide  
  Legends and Lore Adds Some Cool Details
Expanded Play Players Option: Skills and Powers Makes for More Advanced Play
  Players Option: Spells and Magic Makes for More Advanced Play
Warrior Handbooks Complete Fighter's Handbook  
  Complete Paladin's Handbook  
  Complete Ranger's Handbook  
Wizard Handbooks Complete Wizard's Handbook Mages and Specialists Information
Priest Handbooks Complete Priest's Handbook Druids and Clerics Information
  Complete Druid's Handbook  
Rouge Handbooks Complete Bard's Handbook  
  Complete Thief's Handbook  
Race Specific Books Complete Book of Dwarves  
  Complete Book of Elves  
  Complete Book of Gnomes and Halflings