Beaten:
FFI
FFII
FFVII
FFVIII
FFIX
FFX
FFX-2
FFTA


Played:
FFIII
FFIV
FFV
FFVI [Got right to the end, then my comp crashed and lost my save. I haven't played it since]


So it's mostly the middle ones that I've missed out on. I'm gonna start on FFVI again soon, then work backwards...