Great list!! A few awesome Marvel villains missing though (not completely Spidey's arch enemies, but he has faced them): The Scarecrow (Ebeneezer Laughton, mainly Ghost Rider and Iron Man's enemy but has fought Spidey (look for The Spider and the Scarecrow), Blizzard and Whirlwind ( both Iron Man villains but also faced Spidey).
Probably so many more, but I just wanted to add some that I'm fond of.
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