Just to answer the actual question: choice zun amber can make amplifiers with about 60% power for all categories. Excellent zun amber can make 83%. Supreme zun makes 97%.
Zun does not cover all categories, it has one magic weakness, which is Defensive Affliction Cast Speed. All other magic attributes will be high and equal. According to my experiments, choice zun can go to 71%, excellent to 84% and supreme to 97% for final item magic stats.