Well after almost an hour in the pet store last night comparing the fiber levels in the cat foods while also ensuring that the fat & protein levels remain kind of high I left the store with Science Diet Hairball Adult formula. I'm kind of dissapointed as I don't like to feed any diet with corn in it (corn gluten meal is third on the list and ground whole grain corn is sixth on the list). And I've never been a fan of Hills Science Diet. But I have to think of what may be best for my cats at this point. It has the most fiber and still a decent amount of fat & protein.
I figure since I am switching them over gradually they'll still be getting some good food, Innova for a while. And hopefully they won't need to be on it that long either.

If for some reason they will need to be on it long term I'll find another brand even if the amount of fiber, fat & protein levels are slightly less. Or maybe add some Innova (or other decent food) and serve it mixed half & half.