Something I noticed about Deepholm Trogg farming - if you are the only one doing it, it's quite ok. I did it with a destro warlock (so Mannoroth's Fury + Rain of Fire + Fire and Brimstone) and in about an hour I got enough cloth (as a non-tailor with the potion of treasure finding) to level past Cata enchanting.
By the way for WotLK part make sure to check AH for Abyss crystals for shattering, people tend to post them cheap now that everyone is farming old raids for transmogs. Also (I haven't used this now but I think it still works) pvp epic off-hands/shields cost around 200 honor, from wotlk, and they are disenchantable.