Light and really small on your back? Lone Wolf is the only answer.
If you want super comfortable but bulky on the back...Summit.
I won't really even consider others at this point. I'm a huge Lone Wolf fan. I find them plenty comfortable for all day sits...so I don't see a need for Summit, but the vast majority of people seem to think they're way more comfortable. They are more comfortable, but I don't find that worth the bulk. So I go with the hand climber if I have a super long walk > 2 miles. Otherwise I roll with the sit-n-climb.
EDIT: Look around the used market...sometimes you can find good deals on these stands. THey're not cheap, but trust me, if you're carrying them around, you want a good stand. Spend a year hunting on the ground to save up the money if you need to.