Nightmare Tear should not be used in other sockets than blue, in which piece the socket bonus should be 4 Agi or higher. ArP should not be gemmed for until you have 300-400 passive ArP, at which point ArP becomes the best stat. Until then you should gem for pure
Agility in red sockets. In yellow sockets you should put
orange gems.
You are also missing quite a few enchants (which you are probably aware of): head, shoulders, back, chest and feet (get the +16 Agi enchant here).
When you gem and enchant - this is especially important at higher gear level items, like your chest, feet, legs and hands - you should try to get the best available (+20 Agi > +16 Agi).
4 points in Furor is wasted. Three would be optimal.
As for gear, there are a few upgrades you could make where raiding is not involved. For the neck you could get
[Barbed Ymirheim Choker] from Forgemaster Garfrost in the heroic version of PoS, the belt could be upgraded to
[Belt of the Twilight Assassin] for 28 conquest emblems,
[Banner of Vitory] is a very good trinket acquired through the normal version of ToC5 that can be used all the way up and into ICC, and if you have the money
[Darkmoon Card: Greatness] is another great trinket.
[color=purple][Orca Hunter's Harpoon] is a nice upgrade for your weapon, which is acquired from Marwyn in the heroic version of HoR. Lastly, PvP pieces are not really good for PvE; I would suggest to get
[Blighted Leather Footpads] from The Captain's Chest (the chest aboard the zeppelin) from the escape from the Lich King in the heroic version of HoR.
Edit: By the way, the 4pcT9 bonus is mediocre, so I'd rather get
[Duskstalker Pauldrons] and
[Mask of Lethal Intent] for some triumph emblems. Save your current ones, though, as you might get use for any of them later.