Ok I'm going to say Gallahorn. After certain people whined and cried about how they earned their gallys and it isn't fair that peeps can just buy it,it hasn't been abailable from Xur. Bungie won't restore characters or weapons that are accidentally or wrongfully deleted but they will nerf things if enough peeps cry about it. If someone has enough strange coins to purchase something from xur then they have worked just as hard in the game and probably harder than someone who has recieved a drop. In fact i have watched people get the gally or the hawkmoon their very first raid or in stikes the very first time they are able to do vanguard roc. So imo people who have leveled their characters enough to do dailys,weeklys,nightfalls and Roc have worked harder to get the coins than most players who who have recieved weapons in drops. I still haven't recieved either said exotics and i have played countless hours and completed many many crota raids and vog nml and hard. I'm a very active player and a loyal clan member who despite the repetitive and boring chore of doing the same bounties,strikes and raids over and over again on the hardest settings while recieving the eqivalent of useless gear time and time again still enjoy gaming with my friends and working towards finally getting the drops i want but it would be nice to be able to purchase it from Xur.