I have three pairs and use them for different purposes
Pair of MEC Entrant shell pants. suprisingly warm, breath well, take a serious beating (ski patrolled in them for 5 years), have full length zips and are almost completely waterproof. had them for many years, re-waterproofed them and expect many more years to come.
similar to these.http://www.mec.ca/Products/product_d... 1192594150143
The pair I usually wear are from Rip Curl. They are lightly lined with a VERY thin fleece, have built in gaitors, cargo pockets, inner thigh vents, Belt loops (duh why don't more pants have them) fairly waterproof. Have had them for about 3 years and they are lasting well. I have them a bit baggy to allow for extra insulation when needed. Mostly I like them cause they are blue and have pretty white accents. I will be sad when these die
lastly I got a free pair of soft shell Salomons from the Xwing rally last year. I wanted to show my appreciation to Salomon for the trip, and we were to be filmed so I wore them the entire trip. I like the soft shell pants, but if it's wet out I think they will suck. They were not too warm (good thing, they are more for fair weather IMO but with underlayers are very warm), breathed very well, seem to be fairly tough (not sure how they would take tree skiing or a wipe out in rocks) I don't like that they are black, I like colour, but they are great pants, and when they wear out I will buy another soft shell pant.
this year they are this:http://www.salomonski.com/caus/produ...42-879435.html
I like these better, more street style than old school ski style, have belt loops, but don't have a thigh pocket.
the ones I have look like these