If you want an Anti Sorc barb, basically, you would want 95% resist to all, along with abosrbs to each type of elements.

As we all know, normally our characters can only have 75% resist. But, with gears that +Max resist, a character can have up to 95% resist to all.

You would want 95% resist to Fire, Cold, and Lightning. The sorc won't do any poison damage unless she is with a merc (probably Rogue) with Poison Bow.

Helm:
Blackhorn's Face -> +20 Lightning Absorb, 15% LR

Armor:
Guardian Angel -> 15% Max resist to FR, CR, LR, PR

Gloves:
Hellmouth -> +15 Fire Absorb
Venomgrip -> 5% Max Poison resist, 30% PR, 5% LL

Boots:
Infernostride -> 10% Max Fire resist, 30% FR, 20% frw
Waterwalk -> 5% Max Fire resist, 45-65 life, 20% frw

Belt:
Snowclash -> +15 Cold Absorb, 15% CR
Thundergod's Vigor -> +20 Lightning Absorb, 10% Max Lightning Resist, 20 Str, 20 Vita

Weapons:
Lightsaber -> 25% Lightning Absorb (Or dual Lightsabers)
Blackoak Luna -> + 0.625 Cold Absorb per Clvl , +1.25 Life per Clvl

Rings:
Raven Frost -> 20% Cold Absorb, 15-20 Dex (Dual Raven)
Dwarf Star -> 15% Fire Absorb, Mdmg reduced by 12-15, 40 life (Or Dual Dwarf if opponent doesn't use Orb/Blizzard)

Amulet:
The Rising Sun -> +0.75 Fire Absorb per Clvl
Mara's Kaleidoscope -> +2 Skill, +5 all stats, 20-30 All resists.

Socket the Armor, helm and Shield with UM rune.
15% all resist Armor and helm, 22% in Shield gives
52% all resists.