Hi,
My family of 4 have just returned from a 2 week break on NSW Mid North Coast.
We recently (approx 4 weeks ago) purchased a 12ft Customline Deluxe Off Road 2008 model 2nd hand. Like you, we searched for a long time and decided for our first purchase, 2nd hand Aussie made was better for us.
Now, we tossed around the size issue aswell and agree that the smaller tent size is easier to setup, however, we found with our 2 kids 8 and 11, the larger tent would be better suited.
This being confirmed during our recent holidays, especially as we travelled with another family and had their kids visiting us aswell.
When weather turned nasty, is was great to have the extra room, which also included the full annexe (walls etc..
If your holidaying is lots of touring, that is 1-2 night stays, the 9ft or 10ft is better suited, but if you park yourself for a week or more and if you chose to holiday with friends, then the extra space will be smiled upon !
And don't forget, some kids don't see the appeal of sitting around the campfire and would rather be inside the tent at night colouring in, watching movies etc.....
We also found that we could squeeze onto most sites and after dropping into a few caravan sites on the way home, there appears to be a move towards larger sites to accommodate the 12ft Camper Trailer.
Cheers, Scott