Ouch. Who'd do a caster-centric party? You'd have to it pretty late in the process, when you can farm orbs for honing abilities (and honing is expensive) to kingdom come. Because maybe it's just me, but mages kinda suck when they run out of ability uses.
Also, just got Warrior of Light. Nifty guy, but (like Vanille) starting at level 1 is a real pain when your already stamina starved. Still trying to find the path to get to that Luneth guy from FFIII.