As soon as she's a stronger Commando, I'm switching in Vanille with the Debuffing weapon she has. It's currently Level 22 at it's second stage.

Sazh is on his Deneb Duelers, second stage in the 40 level range.

Snow, again in the 40 level range, the second stage of Power Circle.

Really, Sahz and Snow are set for high physical and damage output, though I avoided going Sacrifice Circle on snow cause I still need a viable Sentinal.

I was thinking of doing the same for Vanille, but I figured I might as well improve her Debuffs to keep a bit of a variety, as well as the shear use of debuffs.

With LIghtning, since she's still in the party, I have her starting weapon maxed in it's second stage.