Kraven's Last Hunt is great, the Death of Gwen Stacy will always be a milestone, the origin is timeless, Standing up to the Juggernaut was classic Spidey. However, the way some of the stories are talked about you would think his thousands of comics only gave a handful of readable stories.
What Spider-man stories mean the world to you, but never seem to get any love? More importantly, why?
You've got a good list. I think Peter David's Sin Eater storyline was great. I'm also partial to the Hobgoblin saga, since ASM#238 was the first comic I bought with my own money, so that's the one that started it all for me.