I really can't invest myself in any of this since they're all so boring... and stupid.
But whatever. If he ends up with 1 wife or 5 it doesn't make a whole lot of difference to me. It is already a foregone conclusion that he is going to be dipping his dick in the dumb anyway.
Oh well, Itsuki still seems like the best choice, so it probably won't be her if only because it would be too obvious... and nobody does the obvious stuff these days... and most mangakas aren't savvy enough to double-bluff. That and it won't be her because main characters notoriously have shit taste. He'll probably go for one of the worse ones. Maybe contact lens girl since she is the only one he hasn't flirted with yet.