For those that are interested in the outcome...
thanks for all of the input, your replies for the most part mirrored those of the adults in the group. After much deliberation the decision actually came down to cabin selection. We prefer to have adjoining cabins as it makes it easier to keep track of the kids.
We had decided to be a return to the Adventure but there were no adjoining cabins left so we compromised and decided on the Freedom and the adults would cruise alone on the Serenade in the fall - works for me. The Freedom actually ended up being about $1000 more than AOS, still alot but better than the $2500 we first thought.
Thanks again for the help.