Specifically, powerful weapons earned through story driven quests, upgradeable instead of replaceable.
Throw in some themed "use:" spells to make them unique.
They dont even have to be tied to spec. Theme them on Race, Faction, Renown, literally anything. Then let all the "weapon" drops just be relics you can use to increase their ilvl and customize the secondary stats.
It was just more fun to have weapons and appearances earned from cool shit instead of random drops. Leave that for armor.