System76 Oryx Pro - System76 Oryx Pro is a powerful and customizable laptop that comes with Linux pre-installed, but y can easily install Window and dual-boot if you want to use it for Windows development or gaming.
Microsoft Surface Book 2 (15-inch) - Microsoft Surface Book 2 (15-inch) is a laptop and tablet that can handle the modern PC games.
Dell Precision 7730 - Very robust 17" workstation with flexible configuration options, the cheapest display is not recommended however. Read review here.
ZenBook Pro Duo - A new laptop from Asus with two 4k displays
Surface Studio - A brilliant screen for your ideas, from Microsoft
HP ZBook 17 - The performance of a desktop with the freedom of a laptop.