depending on which comic you read, the specifics are different, but spiderman got his powers from a bite. the only "power" he gets from his costume is webslinging. the only suit to even modify any of his powers was the alien symbiote. his costume does not give him powers. other than that, solaris was correct.
i used to like superman, until everyone made him weak. he used to be able to withstand a barrage of bullets, but now if you spit on him he gets knocked down. my vote is either for Green Lantern or Spider-man.
edit: unbreakable was a kickass movie. i loved it even though it was very predictable. m night shamalan(however you spell his name) is supposedly famous for his suprise endings, but i have yet to see one that surprised me.