Best video card with native drivers?

[Alex]

Hi,
I have about $300 to spend on a new video controller for my desktop.
I'm using f33 with Xwayland and GNOME. I currently have two 27"
monitors and plan to get a third 32" 4K in the coming months. I have
an i7-8700 3.2Ghz on an Asus PRIME Z370-A with 64GB.
https://www.asus.com/us/Motherboards-Components/Motherboards/All-series/P...

 I use my desktop for basic photo editing, playing videos, and basic
office/browser work. What recommendations do you have? Here's my
requirements:

- native open source drivers
- supports at least three monitors
- PCIe x16
- support for 4K
- HDMI output
- audio not necessary

What other specs should I consider? I currently have an old Radeon
HD-5770 but I'm starting to find playing video within a browser is
less than fluid.

$ lspci -k | grep -A 2 -E "(VGA|3D)"
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
[AMD/ATI] Juniper XT [Radeon HD 5770]
        Subsystem: PC Partner Limited / Sapphire Technology Device e147
        Kernel driver in use: radeon

Thanks,
Alex