When it comes to items I tend to prefer Haven the most. Otherwise, if not both, I use Veteran because I find it very valuable for its cheap price. Because of its cheaper price I can buy two items with it and find more profit (sometimes). Afterwards the next items I listed are for slightly different playstyles, aside from the must-have Resilience for any heavy CC

Towering Barrier
Shield
Reduce the Cooldown of Shield by 3.2s. This card also increases the rate of Shield gain when using Aegis.
Level 4

Dire Need
Shield
Increase your Movement Speed by 32% while using Shield.
Level 4

Cavalier
Armor
Increase your maximum Health by 450.
Level 3

Immovable Object
Armor
Increase your Healing received from others by 10% while at or below 50% Health.
Level 2

Last Stand
Shield
Heal for 180 every 1s while Shield is active and you are at or below 35% Health.
Level 2

Aegis
Shield
Your Shield now uses a resource that Regenerates over time instead of using a Cooldown.
Level 1

Haven
Armor
Reduce the Damage you take from Direct and Area of Effect attacks by 18%.
Level 3

Veteran
Armor
Increase your base maximum Health by 16.5%.
Level 3

Master Riding
Armor
Increase your Mount Speed by 45%.
Level 3

Morale Boost
Armor
Increase your Ultimate charge rate by 30%.
Level 3

Chronos
Armor
Reduce the Cooldown of all your abilities by 30%.
Level 3

Resilience
Armor
Reduce the duration and effectiveness of Crowd Control and Slows by 75%.