Well first let's start with armor.
Dusk of potency/brutality would be best for helm and armor
Belt, ring, amulet
Potency, or venom set is very useful
Weapon keep immo weapon as proc is useful.
All the items above will be replaced with new mythic items (weapon, armor, belts, etc) And new set armor will even make the armor obsolete. But it's an envestment till you farm enough coins. Hope this helps a little