There is alot of posts in this section for gearing tips in both arena and battleground. I personally use my pvp trinket and levanthors talisman for pretty much everything i do. when i do arena and am facing a team that i cant burst down i may decide to switch trinkets to the anvil, but generally this doesnt happen. the stacking effect of the levanthors with shield block and your other damage modifiers up can result in some seriously powerful crits on opponents. It's frequency also allows for it multiple times in some engagements and through arena and will usually result in the best ability for controlled strong prot bursts.
"If I'm doing a fight and I need more threat... I try harder. If I'm doing a fight and I need my taunts not to miss, then I wear hit." -Veneretio