Not counting XI, spin-offs, and sequels...

FFI- Beat it once, actually started two other files but never finished either of them. Need to get back to that...

FFII- Beat it once need to get back to it cause its a wonderfully under-appreciated gem of a game.

FFIII- Beat it once, need to start a new file cause it was awesome and deserves a another playthrough.

FFXII- Beat it once, also deserves another playthrough cause its another wonderfully under-appreciated gem of a game.

Except for Tactics, most other non-main FFs have either been completed once or not at all.

I also find it amusing that the games I like tend to be ones I've played very little while I've devoted more time to games I don't care about. (FFX, Crisis Core)