Alrighty, let's start with my char:
http://eu.battle.net/wow/en/character/the-maelstrom/Kvaksalver/simple
Currently, I got the head, cloak, belt, ring and kil'jaden trinket.
Question is, which combination should i use? (Note that I'm using BoS/GS build) I'm pretty sure it's tied between head + ring / head + belt. 
But please, by all means help me out on this one :-)