Rashad, Forrest, Kenny Florian, Diego.
You can't really count TUF 4 because they're vets, hardly up and comers like the rest of the seasons. And Matt Serra's a middle to lower tiered guy. He was before TUF and will be after, he just needs a few more fights before he's gone again.
Best winner, I'd say Rashad because he's still undefeated. I'd like to see Forrest and Rashad fight after the Rampage fight.