Inventory managment

Hey folks,

D4 inventory and stash space is fairly limited and I was curious as to what everyone is keeping. I have legendary items in my stash, along with a collection of gems that are appropriate to my level (67). What exactly makes an item worth keeping? I have a decent idea of where my build is going, but I was considering changing to an ice build (I am playing a sorcerer), but like the idea of meteors, too. With shared space and so many options... whats worth it?