For beginners, I'd recommend Fi/Fi/Bm/Wm. It's what I used the first time round, and it worked extremely well before class change, although afterwards I suppose it was a little inbalanced due to the 3 white magic users to one black magic user, but you could replace the Fighter with a Thief for that, but personally I wouldn't.

The 8-Bit theater party I am currently using on FF Origins of Fi/Th/Rm/Bm is certainly a useful offensive party to use, however it lacks real healing power, as until class change, only RM can heal and even after that the Knight can't use all that powerful healing magic.