I’ve been using a Eureka Spitfire 1 since the Fall of 2013. I paid less than $80 for it and it weighs about 49 ounces after I replaced the steel stakes with titanium ones.
The Spitfire 1 isn’t expensive, yet it’s still relatively lightweight for a fully featured tent. The durability isn’t as good as a heavier tent, but it is still much better than many more expensive options. The comfort factor is also fairly good. The tent is small, but it has full bug protection, is 100% double wall, and has a vent that can be opened or closed to reduce condensation. The rainfly extends almost all the way to the ground which provides good warmth and wind protection in cold temperatures.
Even without seam sealing, this tent has held up quite well in the rain. One night it withstood 11 hours of continuous rain with no significant leakage. Even though it’s not a 4 season tent I have been pleased with the way it holds up in cold temperatures. The tent traps heat so well that if I put my water bottles inside the vestibule it will keep them from freezing even when outside temperatures are in the teens.
If I could spend a little more, I would probably go with a Tarptent or something by Six Moon Designs to save a little weight. But for the moment I am happy with the balance of features that the Spitfire gives me.