As a horde Hpal, you need 2 sets.
1 for WSG, where you are turreting heals, and 1 for WSG/AB, where a well timed HoJ, exorcism and HS offense can win you the game or the fast cap.
For the offensive stuff, you need hit cap. My profile is BiS for that, minus LFH, AGM, and the cloak should be of the Sorc variant (5/6 Ambassador, and STILL NO CLOAK).
There is some dispute as to the shoulders, but the resilience and armor of BoA outweigh Magician's Mantle in survivability, and the crit is nice. Same with the resil on BoA weapon.