Fi, BB, WM, BM

Fi, BB, WM, RM but switch RM to BB while he has better armor.

You get some of black mage's strength(group damage), with a little slower growth in charges, and lack of Nuke/Flare....
But RM is enough of a BM to fill the role, and the armor and weapons are sooo much better.

/nod... it's a good party.