In reply to ROSP:
I've always used Mammut Base Jump pants for absolutely everything and carried a cheap pair of lightweight waterproof over trousers just in case.
They are outstanding in every way and I just can't fault them. Skiing, climbing/mountaineering in everything but heavy rain and I've even parachuted in them! I also have a pair of Mammut Splide pants which are a heavier version of the Base Jumps and I only bought them as I found them in a yard sale here in the States for $20 so why wouldn't you!
You won't be disappointed.
HTH, Den