My first pick would have been Styles, but as he's in the middle of his title program right now it would make little sense to give him the contract as well.
My second pick was Owens, for obvious reasons. As Styles it out, I'm going with him.
Third would have been Bray, but I think that he should win it as part of an anti-Authority storyline. It doesn't make sense to him to carry the briefcase before the story stats, there needs to be a heel Authority champion in place for him to face off against first.
As an outside choice I'd go with New Day. Kofi or Big E, doesn't matter which. This only works if they drop the tag titles before the PPV. They can drop the tag titles tomorrow, then announce on Raw that they're going to win Money in the Bank; I don't think that it'll stop their momentum at all and it's been a stated goal of theirs in the past to get Kofi the title. The main point of this (besides New Day being awesome) is to get them out of the tag devision as they really overshadow everyone else, and basically giving Enzo and Cass the spotlight for their chase. New Day can always come back later.
Overall, I think the most important thing for this years winner is that it must be someone that the fans like. Last year with Sheamus was really terrible. There should be excitement from the winner, not a sense of dread.