PoE Shockwave Totem, Golem builds

Could I have some advice on what I should be working towards now as cold SWT? I'm mostly doing sanctums at the moment so damage is more important than survivability, but I wouldn't mind cheap upgrades for that either. I am working on a +2 wand following the crafting AMA that was posted here, but wanted to make sure there was not another easy upgrade before I continue spending all my currency on it. Pob: