If you are using level 55 pve armorings for the set bonus the BiS combination is 162 armoring, 162 mod, 162 enhancement, same rating as brutalizer. You only lose 3 expertise per piece of armor with this so you'll have 2012 expertise in BiS gear with 2pc pve set bonus. For 2018 expertise, a combo like mmerry's is necessary but you get less stats while gaining little expertise.