So I don't know if it helps, but you can look up my armory here, http://us.battle.net/wow/en/character/thrall/Gorgol/advanced and I am trying to figure out which cloak would be better for a Protection Warrior. I am currently wearing Spritguard Drape http://www.wowhead.com/item=69800 but I was going to buy either Floating Web http://www.wowhead.com/item=58190 or else Gray Hair Cloak http://www.wowhead.com/item=58192 I think that the Gray Hair Cloak is intended to be the tank cloak and the Floating Web is intended to be the DPS cloak, but I feel like I would be better off reforging the expertise on the Floating Web into dodge or parry rather than reforging the expertise on Gray Hair Cloak into mastery, since I would get so much more mastery that way. Any suggestions? If I understand correctly, mastery>parry>dodge but you should try to keep dodge and parry close due to diminishing returns, but I also figured that maybe I got that wrong and I should just be trying to calculate the greatest overall avoidance with those cloaks.
Personally, since you're at at 379 ilvl, I'd wait out to buy the VP cloak - only 2 weeks. When I was doing my VP shopping I prioritized the things I could not get in raid for my tank i.e. neck, cloak and sigil (pally, dk and druid); boots and bracers were somewhere in there, but since I have 9 85s farming, I was moving those things around to the toons that were raiding first.