Probably 20ed/6str/8life with either dtm or mana. Cold res wouldn’t hurt as a 4th mod either if you need it since cold res is one of the factors that diminish chill duration. You may find that you prefer using 75 cold res + HFD vs say, a barb with some cold damage, since it allows you to keep string of ears and a damage armor on instead of having to swap to spirit shroud or deaths sash.
Anyways, 4th mod is just a bonus, I reckon 20ed/6str/8life are the main stats to look for on an offensive shield, which is what it looks like you are missing considering the other options you already have