I've had great success with Lenovo X1 Carbon laptops running Linux (Debian with XFCE). I've also had good luck with the older Dell XPS laptops. Getting either of these for $2k would require a sale and if you want to run a lot of Docker containers you'll need to pick a beefier model.

My only annoyance, which seems to cross brands, is that none of the newer laptops support the deeper sleep modes.