[Faceman]

okay, let's do this (standard items only)
my setup would be:
Cavalier:
+20% acid
+20% fire


Helm of the Rock:
+25% acid
+25% cold
+25% electric
+25% fire

Boots of the North
+50% cold

Cloak of reflection
immune to electric dmg (reflects)

Amulet of Seldarine:
+5% Magic

Ring of Gaxx:
+10% Magic
immune to poison

Ring of Fire Control:
+50% fire

Belt of Inertial Barrier:
+50% to magic dmg

Delryn Family Shield:
+30% fire
+30% cold

Shgadow Dragon Armor:
+50% acid

Purifier:
+30% Magic

total:
Acid: 95%
Cold: 105%
Electricity: reflected back to source
Fire: 125%
Magic: 45%
Magic Dmg: 50%

I'm not quite sure, but I think the Delryn shield is not restricted to Anomen only, sadly the Corthala armor only works for Valygar so I couldn't include it which would have brought the magic dmg res up to 75% (with only suffering a 25% setback for acid).
Helm of the Rock can be substituted with Helmet of Defense in the beginning,
Ring of Fire Control by Ring of Fire resistance.