Early league I usually use Rise of the Phoenix or Dawnbreaker.

1. When transitioning to block based, make sure you get a Shaper Shield (Armour based).
2. Next use either Pristine Life Fossils OR Harvest Reforge Life.
3. Your goal here is to acquire Recover 3-5% HP on Block (5% being the best).

If you manage to hit Bonus Maximum Resistance, Physical Damage Reduction OR Gem Reservation, you now have an insane shield.