Hmm; difficult to say.
Depends on what you consider 'over'. If you just go by illiciting a reaction form the crowd...Vickie Guerrero, you can't hear her speak because of the booing. in temrs of wrestlers, people like Santino and Ryder get real fan support, Not to mention strong merchandise selling. But in terms of all round over (fan support/reaction, merchandising, having the company behind them) - Rock, Cena, Punk, DX, Bryan, Taker.