Sorry, forgot about that.
I know that I suggested some expensive Items, but You always could get them later(buy Dove's Harp now and the Mandoline later, for example).
Here come the Details:
Badge(1,400gp MIC Version, was apperntly reprinted and is more useful than the version in CompAdv): 3/day +1 on your Inspire courage
Mandoline(no MIC Version found): 1/day each levitate, magic circle against evil, crushing despair, dominate person & good hope
The Badge of Valor is now Part of an Magic Item Set: Regalia of the Hero(IMO made for the Marshal from Miniatures Handbook).
Helm of Tactics(2,000): 3/day for all allies within 60ft. from you +2 on melee weapon damage for flanked enemies, 10 rounds duration
Horn of resilience(5,000gp): 2/day 50 temporary hitpoints for target of your inspire greatness(last as long as your bardic music) or DR 5/- for 5 rounds
Set Benefits are 1/day +5 to a single attack for single ally and 1/day grant move action to single ally.
In case you somehow have/can get the Dragonblood Subtype(or take the Dragontouched Feat), Draconic Aura is a good Feat
and you can use the 3rd function of the Horn with it as it would count as a major Marshal aura. If you dip into Marshal, there
would also be a 2nd function on the Helm for minor aura(and using Dragon Magic you can exchange your major aura for a Draconic Aura).
The Gloves are good to have for Magic Missile(which Bards normally can't get), in case you want to hit something that's etheral,
has high AC or a Misschance.
At higher Level you might also want to look into Runestaffs, as they give you access to Spells to cast with your Slots(and your casterlevel!)
and some of the more expensive ones are Magic Weapons too. And no, I'm not browsing thru all Runestaffs to evaluate them for you