Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  15 gold pieces
(9, -1, D:5)
  a +0 ring mail

Level 6 of the Dungeon
[Shop] Vuustra's Assorted Antiques
  2 scrolls of magic mapping (161 gold)
  a +2 robe of fire resistance (407 gold)
  a potion of haste (230 gold)
  a +0 ring mail of cold resistance (253 gold)
  a wand of paralysis (7) (207 gold)
  a piece from Xom's chessboard (15/15) (460 gold)
  3 potions of curing (207 gold)
  a +0 pair of gloves (103 gold)
  a +0 ring mail (92 gold)
  a +0 lajatang (345 gold)
  a scroll of teleportation (69 gold)
  a +0 trident (80 gold)
(0, 0, D:6)
  9 gold pieces
(15, -1, D:6)
  a +2 vorpal spear