Look into the Mammut Champ Pants for softshell. They are a bit much for the warmer months of summer, but they are great in the early spring/fall and winter. Mammut has a weird sizing chart, but they give you the most options to find the right fit. I am tall so I was pretty much limited to Champ Pants.
As for waterproof, I always carry the Arc'Teryx Alpha SL Pants. They are full zip, super light, and they pack down super small. I dont feel bad about carrying them, even if I have only used them a few times.
The Champ pants can handle light rain no problem, and they dry out super fast. But that is a feature of all softshell pants I am sure.
Hope this helps..