Depends on your usage, but for me, my favorite backpacking/hiking/elk hunting/warm weather/active pants in the world by far are "C9 Golf Pants" from Target! They're feather light (10 oz), stretchy, very tough (I've got 4+ weeks of hard elk hunting and backpacking in one pair with no holes), water resistant, dry in a heartbeat, and best of all, they cost $30. I currently have 4 pairs in my closet in case they are discontinued, which they might be since they were on clearance for 60% off a few weeks ago.
No, they don't look "cool" like the big money brands, but they perform better and cost a fraction. And I've owned a lot of stuff from the top names.
Pete