Our Outwell indiana8 tunnel tent(which we bought last year) is the bees knees! *(have a look at my gallery) Absolutely no leaks and masses of space...you can even back the car into the tent to pack it if it's raining! We have two kids also and they love the space in this tent, and for the adults you can stand up throughout the tent without stooping. It has a bathtub groundsheet which is easy to unpeg if it gets muddy and needs cleaning. It takes two of us about an hour to erect but the first couple of times it took us about two! After suffering the cramped conditions and stooping issues of our first dome tent this tent is fab. Oh, it has 3 bedrooms - two 3 person pods with a divider and one 2 person pod at the other end of the tent which we usually use as a storage area/changing room.
Happy hunting!
------------- Experience is something you get only AFTER you need it...