Ree's Headgear, but a WSD head will do better. Augmented ACP body w/ mab if you're not using it. The stuff you have you use elsewhere as well I assume, and it's worth keeping for that, but buying more gear for cleaves (aside from massive boosts like martial staff) isn't usually worthwhile. 5000 hp mob dies in 3 hits to both 2000dmg and 2100dmg aoes.
XI Wiki


