Obviously, it's Bret Hart.
It sucks though because I want to vote for Bam Bam Bigelow because I'm such a mark for him. He's one of my favorite wrestlers. The "Beast from the East" was a great moniker for him. In WWF though, he didn't really do anything. For him, it was all about Japan and ECW.
Bret, on the other hand, was GREAT in WWF. Not only that but he was there forever. Hart Foundation all the way up to...well, we all know.