I've been looking at the MSR Hubba tent, which is published to weigh 3 lbs. I bought a Mountain Hardwear 2 man for backpacking and car camping. It has turned out to be a bit heavier than published. One backpacker guy said MSR is one of the few companies that publishes the true weight of its tents. Don't know the validity of that statement, since I have not tested tent weights. So I am considering the MSR.
The Mountain Hardwear has a vestibule and extra space, which is great to have in bad weather. When I got in the MSR at the store, it had extra space and has enough vestibule space. Pretty nice for a 1 man.
http://www.rei.com/online/store/Prod...ory_rn=4500666