I agree man:
Green Goblin, Hobgoblin, Sandman, Hydro Man, Venom, Carnage, Vulture, Rhino, Kraven the Hunter, Jack 'O Lantern, Spot, Doctor Octopus, Mysterio, Shocker, Scorpion, Electr, Lizard, Morbius ... IT JUST NEVER STOPS!
Venom could also be classified like that too, but I always love the villains who are personally connected to the hero with out it being cheesy, good characters like this are Zoom, Green Goblin, Jay Jonah Jameson (He has nearly killed spiderman so many times he might as well be a rogue), and in a way the Hulk
Yeah, Spider-Man is the only character where it's hard for me to tell who is arch-nemesis is ... For Batman it's the Joker, for Superman it's Lex Luthor and so on, but Spider-Man?
He had Venom, the first opponent he was actually scared off, because Venom was superior in every way. He also had Doctor Octopus, who challenged Spider-Mans superior intellect over and over and over again, giving him a run for his money on a regular basis. And then you also had the Green Goblin, who ... well, Green Goblin, you know :-|
(I hate the Green Goblin / Gwen Stacy non-sense though ... should have never been brought up - I was a fan of the Peter + Gwen pairing)
But yeah, because of my own personal bias the best rogue ever is the Void. I find that concept to be way too amazing, even though it's already based on an already existing idea.
I'm happy that Rick Remender is bringing the Void back to some degree in the upcoming Uncanny Avengers comics.