Isnt it +9 Es?
But i have found a four open socket staff w/ points in ES and chilling armor, but in hell. Hell would be optimal if you want normal items to get good mods.
Lazuruk quest basically adds sockets to an item. If you read the items section on purediablo.com, items max sockets depend on the item level. If you find an armor that can have 3 socs if found in norm and 4 socs if found in hell, then you try to hunt the one best suited. Then wen you use the lazuruk quest on the item, it will get max sockets depending on what I stated before.
Or jus skip the whole process and find an already socketed staff w/ good mods.
Good luck