Tough question...
Probably Kane (Azazel), since it's probably who Aaron has his deepest hatred and would want to leave with a victory over him.
Storme would probably be my 2nd choice, since Aaron has a mix of respect (really looks up to him, wrestling-wise) and dislikening towards him (although not total), and Evers would probably be my 3rd, since that's like Aaron's idol, in a way, especially when it comes to the way Evers acts, talks, etc. .. Just his character