With Blizzard's restructuring of PVP gear seemingly ever other day, I've come across some issues in using conquest to upgrade. I can't decide what order I should pick up Tyrannical pieces from here. The majority of the pieces are small upgrades in normal stats with small losses in pvp stats.
"If this situation goes, PvP users must raid to win PvP fight. We don't want this situation. plz think about Asia PvP users.
We have a plan. It should also help with the fact that you can ugprade 5.3 PvE gear but not PvP gear."
-from a Tweet response, front page of MMO-C currently. There's a longer answer around somewhere, but they're limiting the ilevel for PvP, as I recall, and changing the way PvE gear works in BGs/Arenas rather than bringing item upgrades to PvP... which means you won't be upgrading anything.