So the following site has loot listings by class. I found it extremely helpful in figuring out where to take Prune to get him geared up. It has loot by instance, a section for your blue set pieces, a section for random boe drops to look for, and sample gear options based on build type. I highly recommend you check it out. It's not fully updated for 1.7/1.8 yet, but there's still a lot of good info there.
Maybe a sticky for this? Seems like good info to keep on the front page.