Because nobody else will do it, I'll vote III. I really do love III, though there are other titles that I really love. But those titles get enough support on their own, while III doesn't, so I'll lend III a hand.

III is the most underrated entry in the series, no doubt because it took 16 years before it came out in the west. Yet it's also one of the most important titles in the series, the game where many of the series' later stereotypes and elements were born in. If any game can be called groundbreaking, earthshattering for its time, it's III without a doubt.

III has influenced every title that came after it. IV almost downright ripped-off its final villain, V took its job system, VI I hate and won't talk about. Even IX took the motivation of the villain of III (Zande) and applied it in a more developed way to Kuja. But not only that. In this game, the Enterprise, Moogles, final boss music and boss music was born. In this game, villains got a reason for being who they were. In this game, the series tried to be deep and deal with matters like the meaning of life for the first time.

So much came from this game, and most people just can't see it. But even if you take off the nostalgia glasses, III is still, no matter what version, DS or NES, you play, just an all-around fun RPG to play through, even now, in 2010.

Long live Final Fantasy III!