Okay so I PVP'd up to level 80 with a frost mage and then Cata exp was nerfed so I flew to level 85 without doing any PVP and then put that character away until Mop was released since I wanted to level a Warlock for MoP. If I want to get into PVP with my frost mage will level 85 PVP gear from Cata content work in level 85-89 MoP PVP? I don't have any PVP gear since level 70 so I will need to get some (and I only have 300 honor).
How much PVP power/resilence will I need for a frost mage level 85?