A rogue with a strange rapier. A powerful melee weapon with one hand that you get after you have been dungeoneering for some time The minimum requirement is 80 dunge to get it making use of the dunge reward system. Most chaotic weapons are the strongest in their category.
Bandos chestplates and Tassets. Prices are dropping, but these are typically the best items to have in the event you're able to pay. 12M for one item and 12M for the next. They give a spiritual and strength bonus.
I'm not an expert on helmets, however if you're killing you need the complete Slayer helm due to its extra bonuses (likewise Salve amulet if it's pertinent) and the Verac helm in other cases.