FFXII because not only is it one of my favorites, but it's perfect for this scenario because it has the most to do in terms of sidequests and such.
FFX, on the condition that I can try the International Version, because now that I have nothing else to do I can tackle the impossible monster arena and the dark aeons and such.
FFVIII because it's the most fun to break and it has my favorite world :3

EDIT:

Oooh but maybe I could substitute FFXI for FFVIII. Social needs partially fulfilled!