Almost there....a few small adjustments.
[quote name='Jesus_S_Preston']Well, to the best of my knowledge:
Final Fantasy - You can get it on the NES, but it would probably be easier/cheaper to get the "Dawn of Souls" GBA game that includes it and FFII. You can also get it on PSP for about ten bucks, or cheap on the iPod app store.
Final Fantasy II - Same as the first. (Never released in the U.S. so GBA/PSP/etc.)
Final Fantasy III - Wasn't released in the US on the NES, so you'd want to go with the remake for the DS. (This is the only version outside of a fan dub on PC emulator)
FFIV - Besides the original, there's a GBA remake (which has technical problems), the DS remake (the best currently available choice), and an upcoming Complete Collection on the PSP, which will include FFIV plus the "After Years" episodic sequel released on WiiWare. (Also available on PS1 Final Fantasy Chronicles)
FFV - It's on the SNES I believe, with a GBA remake. (Never released in the U.S., but is on the PS1 Final Fantasy Anthology)
FFVI - Same as FFV. (SNES release is superior to GBA, there is some censorship and the GBA cannot play the audio at a high level. The PS1 Final Fantasy Anthology also has this.)
FFVII, FFVIII, FFIX - On Playstation, but it'd probably be easier/cheaper to download it from PSN for about ten bucks and play it on your PS3/PSP. (Some technical issues are known to crop up on PSP. Outside of FF7 which wildly varies in price, the other original PS1 sets are inexpensive to obtain)
FFX, FFXII - Only on PS2 (and let's not forget FFX-2....no wait, let's forget)
FFXIII - On Xbox 360 and PS3. The 360 version has multiple discs, the PS3 version only uses one.
FFXI is an MMO on PC/PS2 (and 360), but it's not a normal RPG like the others so you'd probably best just skip it. (totally agree). Some of the older ones were ported to the PS1 in collections but I'm not sure which (FFIV through VI), and some of the PS1 era games were also on PC (7 and 8), but you'd probably best stick with the non-PC versions. (PS1 originals work best)
As far as the "Different in the US/Japan" thing, the early games were released out of order in the US. They skipped right from the first game to IV, and called it "Final Fantasy II", for example. (Followed by FF VI being called part three). Only the original versions are misnumbered, all the remakes use the correct numbers and when FFVII came out in the US, they just called it FFVII and went from there.[/QUOTE]