Its either all or nothing. Wear Full Melee armor, or full mage armor (i recommend the former STRONGLY, mage armor does next to nothing in barrows), because if you mix and match, you wont get enough of either. As Runescapefan said, Wear Melee armor (verac's armor is especially useful for this), and mage the brothers in melee armor. To further save money, do not use Blast or Wave spells, stick to either Darts or Fire Bolt with chaos guantlets. For the record, i use 1 Super attack, 1 super Restore and 1 prayer dose per chest loot.