Michelle McCool really isn't getting enough credit in this thread. She's a genius. Despite having very little talent, her spot as an elite WWE diva is assured basically forever, and all because she fucked a corpse. Literally.
Of guys on the current roster, my votes would go to Chris Jericho, Kofi Kingston, Kane, William Regal, Matt Striker and David Otunga.
I think HHH could be quite smart too - of course this is all speculative.
It's almost very difficult to estimate the intelligence of the guys who don't speak English on camera, such as Yoshi Tatsu, Vladimir Kozlov and The Great Khali.