OpenBSD daily driver here :D! Likely any Lenovo will work - they are solid machines, most of the devs run them.. etc

Few things to note:

- For gaming, your options are going to be limited by game availability more than your graphics card (most likely).
- For app availability, you have two ways of dealing with missing apps:
- Wait for it to get ported (passive).
- Port it yourself (active).
The OpenBSD ports framework is fantastic for bringing in new applications, it supports _most_ build tools (GNU make, cmake, go... etc). Don't be afraid to poke it while trying to get your fav apps to work! (see ports(7), bsd.port.mk(5), port-modules(5) and packages(7) if interested!) More often that not, you will just end up writing a simple Makefile and things will just work!