1 or 2 caster bard (going sublime chord or multiclass sorc or wiz?), 1 skillmonkey bard (multiclass factotum or rogue?), 1 "gish" bard (think bard\pala or bard\warblade etc, maybe going into abjurant champion?), 1 healer bard (multiclass cleric? Maybe arcane devotion with some healing domain?)....

Than keep going untill you have covered everything a good party "needs", then sprinkle in the rest of the bards where you need more of what you already have.

Then equip them all accordingly with magic items (alot of wands!) and go get em'!