Right now, your armory isnt loading correctly for me. But as far as what you need for arena as a disc priest, it really depends on what bracket you're planning on. Specs and gear differ almost every bracket. For 5v5, its ideal to get 2 pieces of t9(9.5). For every bracket, you should have some decent spell pen and be hit capped for fears. I cant really help you by giving you exact numbers as I havent played my disc priest since BC, though I do keep up on these things.