Thanks for your comments, folks.
MFL the 30' and 37' numbers are from the specs, not the model number. The one that I really like the floor plan for is the
Jayco 321RSTS.
Shadows4 that is very true - both points. Either option is going to cost some big bucks so I may as well get what I want.
Lexx my days of traveling with kids are behind me. I hear you that I would be able to make do, but that's a lot of money to spend to feel like I am making do. As you can see I am talking myself into the bigger unit! lol.
We won't be buying for at least a year so I have lots of time to continue doing my homework, but getting it narrowed down does make the whole process seem a bit less overwhelming.