What I'm looking for specifically is an addon that would tell me, after a boss kill, whether there are any spec-appropriate upgrades to my currently equipped gear and what they are. Basically it would pop up the same list of loot the dungeon journal does when you filter it to your spec, minus any items that are a lower ilvl than what's equipped in that slot. We can figure out for ourselves whether it's appropriate to use a charm. Bonus points if I can open some kind of window, select a slot, and see EVERY PvE item that is a greater or equal ilvl as the equipped item, so I can find upgrades for my weakest items first and see which raids I'll find them in.
Does any addon like this exist? If not, would anyone be willing to help write it?