ones that i have kept: 3 vex mythoclasts 3 thunderlords 3 icebreakers 2 gjallarhorns (i'll keep a third if/when i get it) i've kept duplicates of a couple other guns as well, but those are the only exotics. also, i only have one nechrochasm, but i'd keep two more so each of my characters has a trophy gun from CE.