best party?

Well, depends on how far it is for me.

I have a bunch of different preferences, although I've yet to finish the game. XD

The team that's gotten me through a good portion of the game was most definently:

Jenny(Refia) - White Mage (honestly, her physical and magical offense isn't half bad. It hits in the hundreds, but every bit of HP counts.)
Arian(Arc) - Black Mage (Killer Thundaga/Bio/Quake/and Drain)
Luneth - Monk (... I love 'em!)
Isiam(Ingus) - Dragoon (Hits over 9999 on some, and his jump ability really saved me in most battles. Especially bosses!)

But I think the best team is:

Refia - Devout/Summoner/Knight/Ninja (Depends... I trust girls with healing because I think if I leave it to the boys, I'd pretty much be dead)
Arc - Magus/Devout/Sage (Magus if Refia is Devout, Devout if Refia is a Summoner, and Sage if she's a knight/ninja)
Luneth - Monk/Black belt/Dragoon
Ingus - Dragoon/Magus (Magus if Arc is a Devout, Dragoon is Arc is a Magus/Sage)

I think that would be a pretty good team. Sooner or later, I'm planning on going through with at least a million and two different combanations on each person. ^-^;