I think this is correct:
Copper Full, lvl 5, 80% weight reduction, Base AC 8
Bronze Full, lvl 9, no weight reduction, 5% slash immunity, +3 Discipline, Base AC 8
Platinum Half, lvl 11, no weight reduction, +2AC, Base AC 7
Iron Full, lvl 12, no weight reduction, +1 AC, +3 Discipline, Base AC 8
Plat Full, lvl 15, no weight reduction, +2 AC, 5% slash immunity, +3 Discipline, Base AC 8
Addy Full, lvl 18... (soak 5, don't know other bennies but think is identical to Plat Full)