Gear wise you are more than ready for Naxx as an OT immediately, and should only take you a few runs till you are ready to MT it. I would work a little on your hit rating so you do not miss a taunt or opening attack on a mob at an inconvenient time. Overall though your gear is very good, thank you for not being one of the "I have 21k hp and half greens, I am zomg ready to tank" guys. It is a very nice change.
I have some gemming changes for you -- replace all the dodge/stam gems with expertise/stam gems, get 20 hit to gloves and a weapon chain. The dodge is nice, but you want to hit the target as Tatt said. Also, work on replacing those trinkets. Heroic AN for the stam trinket and regular HoL for the defense trinket (it's still a nice chunk of avoidance) ideally.
For Badges I'd say: Amulet, Belt (If you can't get the AN one), Chest, Gloves -- and try to pug VoA and Obsidian Sanctum-10 weekly to snipe a lucky Tier drop
Thanks for the responses. I'll work on my hit rating. Also took your advise on VoA and OS... to be honest, I didn't even know what those were until looking them up on Wiki. Ran VoA last night, but they made me DPS lol.
I also picked up the neck piece. Hopefully I can get the glove drop from OS.