Guardian Angel

Guardian Angel is an armor with +15% to max All Resistances, +1 to Pala Skills, +30% FBR and 20% ICB. Nothing else in the game gives anything close to this much max resi so it is super useful against any elemental damage.
Templar Coat is an exceptional unique so it can be upgraded to Hellforge Plate (elite), which will have higher defense but also higher requirements.
Ethereal version of this item is highly recommended as it has 50% more defense and can be used by a mercenary.


GUARDIAN ANGEL
Templar Coat → Hellforge Plate
Defense: 770-825 → 1178-1590
Durability: 60
Required Strength: 118 → 196
Required Level: 45 → 66
+1 To Paladin Skills
+30% Faster Block Rate
20% Increased Chance Of Blocking
+(2.5 Per Character Level) +2-247 To Attack Rating Against Demons (Based On Character Level)
+180-200% Enhanced Defense
+15% To Maximum Poison Resist
+15% To Maximum Cold Resist
+15% To Maximum Lightning Resist
+15% To Maximum Fire Resist
+4 To Light Radius

Description and picture(s) are valid for the official Diablo 2 servers.