Looking at things with Bully still holding the belt (which I think he does at BFG at the moment; the only thing that would change this is if Hogan came out and said he is cleared to wrestle, to which I think they'd drop the belt off Bully and set up Hulk vs. Bully @ BFG), I think my favorite possible match would be AJ vs. Bully. The story has been in place since AJ left and A&8s haven't been able to get their hands on him since he turned on them. AJ vs. Anderson in the Finals would set this match up nicely.
IF Aries cashes in and wins, I would like to see 1 of 2 things. Styles vs. Aries to headline BFG, or the injection of Sabin into the series to replace Aries and have him go roughshod through the competition until he finally gets his chance to get revenge. Styles vs. Aries doesn't need much story as the match alone is a big selling point (for me anyways), and while Sabin/Aries is also a stellar match on paper, the story that they could go with for the match would be one I would enjoy watching unfold.