I only dabble in transmog, but I have been running older instances recently for achievements/mounts/pets/recipes/what-have-you with some guildies. Since I have no idea what pieces are desirable or valuable, I generally post stuff to the AH for roughly double the vendor price, and if they do not sell in a day or two, just vendor them off. Looking at your list in the OP, I know I have 3 pieces of the Warlord's set from last night's Kara run sitting in my bank until I can log on and post it all, and I am fairly sure I have picked up Bloodfist from MC pretty often in the past.
Since you clearly know far more than I do what is wanted by collectors, would you be interested in buying any of this for your set sales? You can pay whatever you feel is fair, as I assume it would be higher than what the vendors have been giving me ;), and I am not really doing this for gold.
If you are interested, hit me up in game or mail me a list of what you would like me to keep an eye out for you and I would be happy to either hang on to them, or COD them to you. I would much rather see them go to a good home than turn into more vendor trash.
Edit: Whoops, I thought Warlord's was in your list, but I was apparently confusing that with Warmonger's. See, I told you I don't know much about this! Anyway, even if that stuff isn't what you are looking for, I am sure I have encountered the stuff you are.
Edited by Pipikaula on 4/17/2012 9:59 AM PDT