1. FFT (I don't care what you say, it deserves mentioning because it is by far the best. You can all suck it)
2. FFVII
3. FFVI
4. FFV
5. FFIV
6. FFIX
7. FFXII
8. FFXIII
9. FFIII
10. FFI
9000. FFX
9001. FFVIII

Have not played: FFII (not enough to really judge, anyway)