From a min/max DPS perspective, in order of easiest to acquire to hardest to acquire (I use the terms "easy" and "hard" loosely since DH is basically trivial):
Weapon: Banneret / Champion's Lance
Head: Conquistador Elmo
Body: Kokoroon's Scale Mail / Solid Scale Mail
Hands: Warden's Gauntlets / Mitts of the Lone Knight
Waist: Penance
Legs: Leather Skirt or Tarred Leather Trousers
Feet: Cavalry Sollerets / Bladedancer's Jackboots
Jewelry: Mythril Choker + Brass Ring x4 or Mythril Choker + Garnet Ring x2
ATK and ACC have the most observable direct effect, point for point.
All non-lance type weapons are inferior to lances except on very specific mob types, i.e. crabs.
