You need to describe in more detail what you mean by "four season." Where you go, when you go and what the weather is like when you get there is more important than the label of "four season."

Most people here are not deep winter campers, so their "fourth" season isn't all that cold or snowy. On the other hand, some other members camp in -30C weather in Canada or Norway. Big difference.

Hilleberg, Terra Nova, Stephenson, MSR, and Mountain Hardwear are brands I would look at.

Henry Shires (Tarptent) doesn't consider his tents to be four season.
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Don't get me started, you know how I get.