My preference would be either KaZar or Two Gun Kid. However, neither of those would be momentous enough for a vol 150. How's about a first Masterwork focusing on a female character? Marvel Age, that is, so Atlas Era Jungle Adventures doesn't count. Since they already went the MPE route with Black Widow, I'd say --


Marvel Masterworks Greer Grant volume 1 (containing Claws of the Cat # 1-4, Marvel Team-Up #8, Giant-Size Creatures #1, Werewolf By Night #20, Monsters Unleashed #10, Marvel Chillers #3-7 and Marvel Premiere #42 --- A really nice done-in-one volume!!)


  --- I'm surprised they didn't do this to coincide with the Women of Marvel books.