Here is the locations for the stalker armor quests for tier 3. These will give a nice base set of armor.
Level 22 Chosen Poorly Gloves
High Pass Chapter 12
Erich Ruher
Level 23 Inescapable Boots
Talabecland Chapter 13
Amalyn Kaufwitz
Level 24 Blood on the Leaves Shoulders
Avelorn Chapter 12
Sorelle Darkglade
Level 26 Head and Shoulders Above Chest
Badlands Chapter 13
Rorik Copperkeg