There's been a few candidates.

Sergio Mora is the only one to go on and win a world title after the show. He caused a shock against Vernon Forrest only to have it reversed a few months later.

Steve Forbes was the only legitimate belt holder prior to appearing on the show and was good enought to face both De La Hoya and Andre Berto.

Peter Manfredo is arguably the most popular fighter. He fought for a world title against Calzaghe, should have really beaten Joe Calzaghe and has looked good against B rate opponents.

Alfonso Gomez scored big wins over Arturo Gatti and Jose Luis Castillo, but got blasted by Cotto.

Sakio Bika is still considered a dangerous threat at 168 lbs and although he hasn't yet beaten a marquee name he's never been stopped against world class opposition in Joe Calzaghe and Lucian Bute

So who is the best?