stick with double wall...
I'd stick with a double wall...any way you slice it, you're going to get a real moisture problem with a single...now some people don't mind waking up damp after a perfectly dry night...others do...I just bought a North Face Tadpole 23...it's fantastic, but small...so if you're a tall or big guy, it might not be very useful for you...but I'm only 5'9 145lbs...it's beautiful as a solo tent, 2 is snug, but def. doable...breathes well, easy to set up, and you can use it as a fast pack when the bugs are gone...oh it weighs in at just over 4 lbs. and is packs down real small (7x14)...I did not come across any other tents that packed down this small...