We have this tent from REI. It's ridiculously spacious, tall, and easy to set up. (There are smaller 6- and 4-person versions, too.) If you need/want even more space, you can add the Mud Room. I'd get a footprint for underneath to protect the base of the tent.
REI also sells a sleep system that may work for you. It comes with an insulated air mattress, a cover, a top quilt, and a pump. I do not have it, but it seems to get good reviews. This mattress also looks really comfy. I have the Exped mats and like them a lot.
If you have an REI anywhere close to you, maybe spend a couple of hours there with the sales reps. They are usually very helpful. If not, they have a generous return policy. If you are ordering from them, become a member first. That way you get dividends back on every purchase, and they'll send you coupons. I think you get something like $20 off first purchase by becoming a member.
Tara
living a crazy life with 3 boys
I am thinking now
of grief, and of getting past it;
I feel my boots
trying to leave the ground,
I feel my heart
pumping hard. I want
to think again of dangerous and noble things.
I want to be light and frolicsome.
I want to be improbable beautiful and afraid of nothing,
as though I had wings.
~Mary Oliver