Collectors and Items List?

Does anyone know if there has been a list made yet of the different Collectors, what they collect, locations and what they give out? I keep getting these items that I know Collectors want, but I don't want to necessarily keep them if the Collectors give out a crappy reward. Also I have gone to Collectors and have had all the items they want, but all I can see is the name of the reward items but not the stats of those items (and I usually pick the cool sounding one that is crap for me!) Is there a way to view the items stats the collector has when you already have the items they want?

Do what I do... drop the items they want then click on them again. Pick them back up and redeem them.

Collectors list

HTH