Just looked back and saw that you have an 8D. Personally, I would stay there. I upgraded from that to a cat 5 on our upcoming spring break cruise because of the price glitch opening day and the crazy pricing. Honestly, just found out about the room size & storage difference and am not crazy about that. We will be booking cat 8s from now on because of that.
Could you please explain more about the room size & storage in the cat 5's?
If I am looking at both cat 5 and 4's do you recommend the cat 4?