I'm also in the same boat. I want to level another DPS class and I'm trying to decide between Bard and Black Mage.

Bard seems like easy mode in my opinion. I was shocked when I was killing little ladybugs and squirrels and found I could move and shoot! The also have silence and good AOE for later in the game.

Black mage is so powerful in the Braylox HM speedrun. I was in awe the first time I saw flare, flare, flare.... mob dead. I wanted one too.

Still not sure what I'm going to level. Bard seems the have the advantage though.