Have you even thought about Tals Set? I know, it sound like crap... well the following is for a lightning sorc, however find the items for Cold Sorc... (Mastery to Cold etc)
Also, as I built my Blizz Sorcs, I relied on Glacial Spike to freeze Non Immunes, Ghost & Spirits are immune including Dolls. Thus your Merc deals with them... also, Glacial Spike supports Groups, especially in Chaos and Baal Runs.
Below is OLD D2LOD INFO, just adjust to what you require. Oh, the 3 piece tals set is just blah... well my opinion, others will argue.
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For my own information:
Following Setup: Tals Set / Magefist / 2x FCR rings / Spirit Monarch (35% fcr) & War Travs
Skills: +2 All Skills +6 Sorc Skills / +1-2 Lightning Mastery (each skill [Lightning Mastery] = 12% Lightning Skill Damage = 112% or 120%)
FCR: 125%
Resistences
...Light 143% with 3x Anya Quest / Perfect Anni n Torch
...Cold 110% with 3x Anya Quest / Perfect Anni n Torch
...Fire 075% with 3x Anya Quest / Perfect Anni n Torch
...Poison 070% with 3x Anya Quest / Perfect Anni n Torch
Mana: +268-291 (+10 Energy)
Life: +317 (+32 Vitality)
FHR: 80%
MF: 183-218%
-15% to enemy lightning resistence
3 Socketable items (add 3x 5/5s)
... -15% to enemy lightning resistence / +15% lightning skill damage
I fail to see how that's good for goldfinding