i would check out a tipi tent like the go lite shangrila 3 or 5.
http://www.golite.com/tents/pyramid-and ... angri-la-3if you are weight concious and wanting a large space, then its the best way to go i reckon.
I have the shangri-la 5 and it has 16 stake points on the bottom, and 4 on the walls. I tried to set it up with the 20 guy out points and it was solid as a rock like any tent with 20 guy outs should. you need a minimum of 4 pegs to set it up. you can stand up and get changed as mine is set at 190m tall using trekking poles. Even their supplied pole is very beefy and should stand up to very strong heavy snow.
the shangrila 3 i think has 5 or 6 sides to its base, but the shangrila 5 has a square base and very easy to setup.
If you go solo, its still light enough to carry by yourself because the inner setup with all stakes for me is 1080 grams.
If you want mossie protection, then the inner nest is 1220 grams so its still ighter than your other 2 options at 2.3kg all up. keep in mind that only 4 can fit with the inner, even though its called the shangrila 5.
add another kilo to it and you can have a wood burning stove to cook and as a heat source to dry your wet clothing.