Check out rei. They've got those monster group ones that you can buy garages/connecting tubes for and literally make a multi tent mansion.
Otherwise, Big Agnes will probably be your best option (unless you make a tarp shelter to hang out in). Specifically, their Wyoming trail line.
It's a tent with a giant vestibule, they even make a 4 person, with two separate sleeping quarters connected by a huge vestibule that can open up and have trekking poles used to make an awning with the door.
The SL version is a couple pounds lighter, but $150 more expensive and the vestibule door can't be extended to create an awning.
Big Agnes has outstanding customer service and lifetime warranty, so you'll never have to worry.
Course, at about 7# and 9# (15# for 4 person version), not exactly lightweight, but if you're car camping, it won't matter. Also, if you're group camping, just split the weight up with everyone. Even the 2 person one can sleep 4 if a couple people sleep inside the vestibule (as if sleeping under a tarp) then the weight could be split up 4 ways, or two people can carry the shelter, the other two carry all the food, etc. The 4 person one could sleep 6.