In order of preference
1) Vanilla/BC
2) Wrath/Cataclysm
3) If neither of the above, take them out completely
Everything after cataclysm, they were just another chore to upkeep by doing trivial content. Bosses were tuned around everyone having them, so they may as well not exist at all. I'm more of a fan of ultra rare powerful pieces of equipment. They aren't special otherwise.