What item should I buy next for my bard?

[Smurflogik]

In my opinion, and feel free to chime in, other bards:

Resists, HP, AC. Pretty much in that order (possibly HP, resists, AC).

You want any gear that upgrades these stats. Everything else is just a bonus. I would not bother with CHA unless you plan to do a lot of lull pulling.

Breath of Harmony is also a cost effective upgrade, as it has a decent ratio, and you get a free song in your twist.