Jet Li.
Or Steven Seagal. He's supposedly already sparred with and beat both Chuck Norris and Jackie Chan. For a fat guy, he's got some skills.
Chuck Norris is pretty good, and yes, he beat Bruce Lee. But if Bruce were still alive, I'd still pick him over anyone. Who else can do over 50 one-armed pull-ups? Or hold an 75lb weight in each hand with arms fully extended? Or kick a 300lb bag of sand up to the ceiling? Or catch grains of rice with chopsticks? Or do one-armed pushups with just is thumb and index finger? Or strike with hands at his side to a target three feet away in 5 hundredths of a second? I think that as good as Chuck was, Bruce loosing to him was a fluke.