My stash has suddenly become full with legendaries and set pieces and now I'm at the point of needing to figure out which ones are worth keeping and which should be trashed. I don't want to mistakenly throw out any pieces that are used for the best builds and then realize I threw out the most rare difficult to attain piece needed to complete a build.....I almost wish there was a website where you could type in the name of the gear piece and it would tell you "trash" or "used for the X build" or "used for both the X and the Y build", etc...Does such a thing exist?
Have you cubed everything? Start with that then go one by one and select the best one if you have multiples of the same item. In the end you should have enough to keep one of every item. A good way to organize them is to look up the best top 3-5 builds of each class and use the wardrobe to save each build once you've equipped it. This way, you're set for most builds and know what is good to keep. Also, try trashing things that can be easy to get like bounty cache items.