I have a BD Bibler Eldorado tent. 5lbs 3oz, 4 season and single wall. I have used for mountainering with two people. Adding the vestibule allows your to store gear outside.

I used this summer in Peru on Huascaran. Had to deal with 60mph winds and came through without a hitch.

MSR Dragontail gives you a hoop design and 45 square feet of space for 4lbs 12oz. It's absolutely huge on the interior, although it won't breathe as well as a single wall laminate...

The BD Tempest is just under seven pounds, so a little heavy, but you get 57 square feet to work with, which is pretty nice as well.

BD Guding Light. 4 person tent @ 6lbs. I use it as a two man tent and bring all gear inside.

NEMO tenshi, BD el dorado, Mountain hardware EV2/EV3

MSR Carbon Reflex 2P. 3 lbs 6 oz packed. Can also be setup as rainfly and footprint only at 2 lbs 3 oz. Has 2 doors and 2 vestibules as well.

http://cascadedesigns.com/msr/tents/experience-series/carbon-reflex-2/product

Hilleberg SOULO. Da BOMB. Go with fly only.