I also run pretty hot (apart from extremities, bloody reynauds) so this is pertinent to my interests. My riding tends to be fairly pedally, so I need freedom of movement from My riding trousers.
Endura mt500s have done a couple of winters, they’re robust, have dwr and are fine to ride in. In the south downs, they’re plenty warm enough all winter but can get pretty toasty spring & autumn. I really rate them.
Just got a set of rapha fast and light trousers (trail pants were out of stock). Do what they say on the tin, almost invisible to pedal in but seem solid enough. At rrp, they are outside your budget.
I’ve tried both fox & nukeproof trousers, both seemed fine but were a couple of inches too short for me (I’m 6’2″) so both got sent straight back.