When I was playing through the campaign, I found some pretty sweet uncommon armour sets for my Warlock, but I soon had to get rid of those sets to level up. But I thought what if there was a way to buy armour upgrades? I don't know if this has been said before, but what if Xur sold some armor upgrades (Like the sparrow ones he already sells) for 23 strange coins or something. It doesn't change the effects of the armour, it just gives the armour light and upgrades the defense to 306/406 therefore you can keep levelling up and keep your sweet looking armour. It doesn't have to be specific to uncomon though you could upgrade Rares too. Good idea?