Torii Hunter can rob homeruns like no other and you see alot more of his defensive highlights than others. Might not be the best but he has my vote.
HW: Andrei Arlovski, Cain Velazquez
LHW: Tito Ortiz, Forrest Griffin, Rampage, Ryan Bader
MW: Rich Franklin, Gegard Mousasi, Jorge Santiago
WW: GSP, Carlos Condit
LW: Kenny Florian, Sean Sherk, Nate Diaz