If you're not really sure what you want, I suggest you look at lots of different floor plans, and take copious notes on what you like and don't like about each one. Try to keep yourself focused on giving each floor plan the same consideration. After you narrow down your choices go back again, and relook the ones that you've narrowed it down to.
Even better would be to rent a trailer in several different configurations, but sometimes that's easier said than done.
Somethings are more important than others. You just have to try to focus, and not get caught up in the hype the dealer throws at you. Thats why I like RV shows, but that can be overwhelming in itself.
Mike