So you've clearly read the guides and have worked at it. I think you're a little light in some areas and perfect in others. I think you can enter naxx, but don't have enough to do well there. i'd suggest:
Svala's Bloodied Shackles - Item - World of Warcraft
Waistguard of Living Iron - Item - World of Warcraft
Essence of Gossamer - Item - World of Warcraft and/or Seal of the Pantheon - Item - World of Warcraft
I'd also suggest swapping your parry gems for dodge/stam gems. Get the better enchant for your pants and +40 stam for your bracer and +24stam to boots. Get the +22 Def enchant for chest and the hodir enchant for shoulders.
If you aren't higher than me in total damage done or total healing done, all comments will be /ignore'd