i am in a guild that is currently clearing naxx 25, and i has warrior (tank) want to get better and join them has mt or ot.
due to my work i didnīt join many raid but joined as many heroics i could.
i am still missing the braces heroic dungeon, gloves(working the rep for them-kirin tor), and still didnīt have any luck whit the red sword of courage (heroic UP), and the trinked from heroics also.
I question your spec, prolly wanna get imp revenge (big threat/dps getter)...check out the new deep wounds spec all the 'cool' tanks are using hehe. Other then that, you might want to think about gemming/enchanting for expertise (8 expt/12stam gems, gloves & bracers) if you wanna MT raids. Gear looks like your on the right path, dont forget a 'belt bucket' (that badge one will last you awhile), shoulder chant (even the old BC one is better then nothin w/ no hodir rep).
Just remember, being a better tank isn't all about gear, when/if you get a chance to raid watch/read-up on all the fights b4 hand, come prepared and you should be alright.