Sometimes folks think they need a 4 season tent - if you are deliberately going out in winter a lot, where it snows and gets strong wind, you probably do. If you are camping on snow in decent weather, and only do so once in a while, a 3 season will get you by.
I would look at the Scarp - it's one of the lighter, less expensive 4 season options. Not suitable everywhere but a true double wall with the option of extra poles, and either a solid or net inner. If you could spring for both, it would be a true 4 season tent - net in summer, solid inner in winter to keep out spindrift, relatively stable all the way around.
Post where and when you think you will need the 4 season tent... bunch of winter campers on here can share what they think you would need for that.
"In the beginner's mind there are many possibilities. In the expert's mind there are few." Shunryu Suzukihttp://hikeandbackpack.com