My favorite class is probably the Psionicist from AD&D 2nd edition. I got the Psionicists Handbook, and really fell in love with the class. I really enjoyed the class supplements back from that time. I still think the AD&D 2nd edition books are my favorite of all time. Some times I used to just flip through and read about all the monsters, the Player's Handbook, and the Dungeon Masters Guide. The old blue text and many monochrome art bits from that time sparked my imagination, and I learned a lifelong love of the game.