First thing I did when gear for the swap from arms/fury to prot was to farm tha mats for the 3 crafted tanking epics.
[item]Helm Of The Stalwart Defender[/item]
[item]Bracers of the Green Fortress[/item]
[item]Gauntlets of The Iron Tower[/item]
After that i ground Cenarion rep for the neck piece aswell as get Devil Shark.
I was also hitting Sha'Tar instances hard in order to get the rep up for the [item]Crest Of The Sha'Tar[/item].
That should be a good start. Another good option is grinding rep for Time Wardens Leggings or picking up some Fel Steel gear.
"We're going to need a bigger dragon."