After trying a pretty fair number of things, I was surprised to find myself gravitating back toward pretty ordinary lightweight nylon hiking pants. Any of a variety of the usual brands, based mostly on fit and what's available. In my experience, the lighter weight fabrics are fine, and these will come in at ~ 8 oz.
They provide sun and mosquito protection when needed, can handle a beating while bushwacking, scrambling, etc., are warm enough when it's cold (down to freezing or a bit lower even without leaving on the long underwear I tend to wear on really cold trips), are fast-drying, and are reasonably comfortable in most warm weather conditions.
I used to wear zip-off versions, but when I counted off the time since I'd zipped 'em off in years, I ditched 'em. YMMV. Not many of my heat or cold sensors seem to have been allocated to my legs. As long as my pants are loose-fitting, I don't tend to notice them much. I'm more picky about footwear and upper body clothing.