I've been drawn here a lot by the sffpc subreddit, and finally decided it's time to join the discussion.
I currently have
1. A QBX Cougar filled with Gigabyte AORUS B450 I pro WIFI, R5 3600, 16GB DDR4 2666 CL16, 256gb SSD NVME, 256gb SSD SATA, an old Sapphire R9 280x dual-x dual-bios thing...