On the site it looks like all their top bags hold 12-14, and the main difference is the material they're made of. I see that the pro and the carolina have 2 water bottle holders (another reason I want a new bag) I know I carry too many discs with me, but I don't like changing them out for certain courses, but I have about 25 discs in my bag at the moment, is there a revo that will carry that many?? I don't want a dual pack though.
The side pockets will easily hold 4 each...though I'll recommend you carry fewer discs and ease up on the dependency to do so by getting a bag that will hold less. Will be easier on your back and make disc choice/selection simpler. Face it, you carry 25 discs because your present bags allows for it.
Buy a pull/push DG cart...or get a smaller bag.
.02 // YMMV