I'm very new to D&D comparatively so I wouldn't know much about the candy... A friend of mine does fave a bunch of olde stuff including the never ending dungeon books. Those are cool, and he also has some 1st ed books that his mother owned. There's so much fun you can have playing olde D&D! 
Thinking of the comic monsters.... have you thought of tracking down olde Dragon Magazine Beasties that never made it to the new Monster Manuals? I have one that feature Dark Sun monsters from like.... 1996? Not sure but it's older than my D&D career. 
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