Playstation era was definitly the golden era of FF. It put JRPG's on the map.
I am too old for these list things. So, here you go:
FF7 and 9 are the best ones for me (if you want to count tactics, it goes in here aswell).
FFX is good.
FF3, 4, 5, 6 are alright.
Rest is a waste of time.
FF8 and FFXIII are abortions.