Personally i feel Bard, should have an enhancing Limit break. As we will always have a healer for the big healing LB. An enhancing limit break wouldn't be an attack like other DPS jobs but maybe provide significant buffs to TP, Mana Regen, Skill speed, Spell Speed, Determination, and clear alignments. Therefore you get the DPS style damage output but its a support LB.

T1: Battle Cry
T2: Fury Brand
T3: Gjallarhorn