rs, you have a lot of choices out there in both insulated and shell type pants. The key is well made 3-layer Gore-Tex XCR seam-sealed fabrics. Shell type clothing lets you layer according to your thermal needs, while insulated is going to keep you warm. Both will cut wind.
If you have a bigger budget, the Arc'Teryx brand will get you the best made clothing with water-tight zippers and seams. Not vouching for best price, here are some links to examples of what I'm talking about:Arc'Teryx SKArc'Teryx MinutemanArc'Teryx Alpha SVMarmot Spartan Bib
Anyway, you get the idea. The best waterproof clothing is expensive, but is very well made, and will keep you dry and eliminate wind.