III, VII, VII - DOC, VII - CC, VIII, X, X-2, XII... and definately XIII for my PS3 when it comes I! I can't wait! I started playing them when I saw the characters if them in Kingdom Hearts and after that I haven't looked back!
One of my favourite RPG sagas. :)
All the way until FFX-2, FFXII is decent but it pretty much died out for me by that point... played FFXIII and I can see a good RPG there but for a Final Fantasy game it's a huge disappointment... :
Still I love all the others.