Here's what I did.
  • 1997: Final Fantasy VII
  • 1997: Final Fantasy VI
  • 1998: Final Fantasy Tactics
  • 1999: Final Fantasy VIII
  • 1999: Final Fantasy V
  • 2000: Final Fantasy
  • 2000: Final Fantasy IX
  • 2001: Final Fantasy II (tasted it and promptly vomited)
  • 2001: Final Fantasy III
  • 2001: Final Fantasy IV
  • 2001: Final Fantasy X
  • 2002: Final Fantasy Mystic Quest
  • 2003: Final Fantasy II (swallowed it)
  • 2003: Final Fantasy Tactics Advance
  • 2003: Final Fantasy X-2
The best way to play the PS titles is to play them in the order they were released, I'd say.