You should give a look in the online build guides you already mentioned, but for other builds, in general Macabre, Core, Corpse, Bone Spirit, Golem, Mage Skeletons, are the best skills to trade, skills in amulet is a whole other story. My main is bone spirit, best stats to me are actualy Max Resource> Essence per Second > Cooldown Reduction > Chance to Crit > Bone Spirit/Macabre/Core Skills > Int > Life. For my BCE is Lucky hit chance > Cooldown Reduction > Essence per second > Blight/Corpse/Corpse Explosion > Int > Life (No use for Critical Strike/Damage)