First off, Welcome to the forums!
Since you have kids you might like the outside shower. We have dogs and after a run on the beach it's really nice to be able to wash the sand off them outside the rig rather than inside and putting the dirt into our tanks. My other tidbit of advice is that what ever RV you look at buying, sit down on the toilet! Most people overlook this very important fixture in an RV but it's no fun to by the rig of your dreams only to find out the first time you sit on the throne that your knees are under your chin. Doh!