Arelith

With new melee builds based on fighters dont need anything else than bronze stuff, viable for heavy enchantment, lets consider to tweek current "expansive" ores to make them again required.

Mithril
-remove the penalty to skills (stealth, hide, trapping...)

Adamantite
-increase its AC bonus to +4 on both, shields and armours, add fort save bonus, and several combat oriented skills (discipline, concentration, and alike).