My family (DH, DD8 DS3, DM) and I had room 8048 on the Wonder a couple of years ago and loved it! I have read the different posts that 8048 was noisy, but we didn't have that much of a problem with it. If you have your verandah door open during the deck parties you will hear the music, but we didn't really hear it with the door closed. Plus we were up at the deck party for most of the party!!!
My mom, who traveled with us on that cruise, is a very early riser and she did hear some of the deck noise (the crew moving the chairs in the morning) that other people have mentioned, but that was only because she was already awake and the cabin was extremely quiet because the rest of us were still sleeping. It never bothered the rest of us, we had so much fun during the day that we were worn out and we slept like babies.
If someone in your family is a particularily light sleeper they might hear some noise in the morning, but you could always bring a white noise machine and I think that it would drown out any noise that you might hear. My baby is and we plan to bring one on our next cruise just in case.
We loved the Cat. 3 and think the price is more than worth it if you can afford it. When we booked our upcoming December cruise we debated seriously whether to get a cat 3 or 4. We ultimately decided to go with a Cat 4 this time, mainly because my mom is not traveling with us this time and our newest addition will only be 1 and therefore will sleep a porta crib leaving us plenty of room. However we will probably go back to Cat 3 or above after that.
Enjoy your cruise whatever you decide!!