The buzz, now building to a roar, started last September, when a rush print of Darren Aronofsky's "The Wrestler" won the Golden Lion for best picture at the Venice Film Festival. Then, last Sunday, the movie's star, Mickey Rourke — who might well have taken the best-actor award in Venice, if the festival's rules hadn't precluded it — won a Golden Globe for his performance in the film. Next up: the Oscars — and "The Wrestler" is looking good.