Firstly KK, Aussie Swag, complete campsite are all great campers. What made the decision for us to purchase a KK was the kitchen set up. I not a fan of cooking close to the canvas so KK won out there, plus it had so much more bench space. The design of the back canvas, and location of the door, In both the KK and CC push out or straight creates more floor space. I liked the fact that the KK did not use any marine carpet (really handy when you turn the water pump on without pulling the kitchen out and the tap is turned on).
KK from 2013 on also changed its design so that you can leave the extra bedroom attached which in your case could be handy.
Regardless of all this you are still going to have storage issues what ever you pick. We can easily fit clothes for us and my 16 year old for a week in the draw and the bed.
Oh and one thing don't get an extra water tank unless you are going to attach them. We took the option of the 70ltr front tank that has the hand pump (pain in the arse) no longer use it.