Armor choice

I would certainly not use Guardian Angel.

Guardian Angel:
Defense: 770-825 (varies)(Base Defense: 252-274)
Required Level: 45
Required Strength: 118
Durability: 60
+180-200% Enhanced Defense(varies)
+20% Increased Chance Of Blocking
+30% Faster Block Rate
+1 To Paladin Skill Levels
15% To Maximum Poison Resist
15% To Maximum Cold Resist
15% To Maximum Lightning Resist
15% To Maximum Fire Resist

Skin of the Vipermagi
Defense: 279 (Base Defense: 111-126)
Required Level: 29
Required Strength: 43
Durability: 24
+120% Enhanced Defense
+1 To All Skills
30% Faster Cast Rate
Magic Damage Reduced By 9-13 (varies)
All Resistances +20-35

Sure, the Guardian has +15 to max resists, but it doesn't actually have any resists. It has lots more armor, but it's been said that resists are more important than armor in 1.10.

Do take note than an upgraded Vipermagi has ~800 defense. I'm sure an upgraded Guardian has a lot more than that, but, other than blocking, that's about all it has going for it.

Vipermagi has +1 skills, just as Guardian does, but it also has resists, faster cast, and magic damage reduction. Just my opinion though....