so i have played every final fantasy above the one that came out for the snes and above. except the online mmos.

what final fantasies below 6 (one with terra and kefka) do you guys enjoy the most, and give reasons why.

what of those 5 final fantasys magic system, combat system did you like? summons on the ones that started having summons ect?

I need help deciding on which ones to buy first.