Dragon Quest V: Bride of Heaven (1992, SNES)
This gaming gem has never been released in the US, and features a secret dungeon at the end of the game which needs completing to see the end proper. Horii, you little devil.
Dragon Quest VI: Great Land of Illusion (1995, SNES)
The first to feature animated monsters and an in-depth class combining system. You also get to ride a flying bed. Best. Vehicle. Ever.
Dragon Quest VII: Warriors of Eden (2000, PS1)
Boo! Hiss! Planned for the N64 but nabbed by the Playstation. The last Dragon Quest to bear the Dragon Warrior title in the US.
Dragon Quest VIII: Journey of the Cursed King (2004, PS2)
Features an evil jester - instantly brilliant in our books.