I know it may have not been the most popular Final Fantasy, but I personally think Final Fantasy 12 had some of the best sound effects for the UI and spell sound effects. Since the team sort of pulled off a FFIX and FFXII look I was sort of expecting these sounds. Oh well, a video below for FFXII sound effects and spells.

http://www.youtube.com/watch?v=yKNCU90lJ2U