Suggestions for decent cold weather hiking pants.

I'm not necessarily looking for snow pants, just some decent pants for hiking and camping in weather between 0F and 40F. Any suggestions, people?

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Update: Thanks so much, everyone! That was a hell of a lot of good information. The good news is you guys are awesome and I now know where to go hunting for some good hiking gear. The bad news is my wife is about to get super pissed at me because I'm buying about ten different brands of hiking pants to test out.