Have you looked at Regent?
Its smaller,700,,and luxury...REALLY all inclusive...ALL shore excursions,tips,drinks,air,hotel,etc...you pay NOTHING when you leave,,unless you WANT extra stuff...so not nickel and dimed,,so nice.
We ve taken 2 and liked the Mariner the best so far...fabulous food,service,cabins,you name it. Must figure out daily costs for all extras on other cruises,,,seems expensive at first,but really not when you really compare.
Tends to your age group,,,and has lots of entertainment,,even at 6 30 in most lounges with dancing and singers..then main show at 9 45...
Have also loved Seabourn,,only 400 passengers and all inclusive,,ex.for shore excursions..
Try giving them a look,,,so nice to be on smaller ship,,easy embarkation,,no lines,better service,,you ll get hooked.