Whatever gives you +1 Taunt Ammo Clips. I know the Large Sunglasses for custom characters do and I think the Wizard Hat does, and I think the Parrot for Ramses does.
3D Glasses or anything else with that same +25% headshot damage if you've got the aim to get headshots.
Reduced Scope Wobble on the Yeti Mask is also nice.
If you play Plunder the items for +10% Movement with Heavy Objects is also pretty nice. I know that the Sapling for the Dead Explorer has that.