This is a bit of off-topic here, since this post is explicitly about which brands people choose. You went to the meta level and suggested that there can be just no such brands at all. This is more a topic for a different discussion and probably different forum (because it’s not strictly speaking about Qubes). I am still replying, but I don’t think that this discussion should continue here.
Did you actually read everything above?
It was also discussed:
This is not exactly true. Coreboot contains proprietary blobs which are required to run the CPUs, Libreboot is “pure”, without any blobs (and can’t work on modern CPUs for that reason). The blobs is of corse a problem from a security point of view. See also: https://forum.qubes-os.org/t/intel-me-real-threat-for-ordinary-persons/7693/2.
According to many people here, Qubes OS runs fine on all hardware listed here: Community-recommended computers. Fast SSDs and more RAM often help more than faster CPUs.
I feel you and totally agree. However, you have to be realistic with how much effort you can put against the government spying and how few actual improvements it would bring to your security. For this reason, the threat model is not just what you want to achieve but also what you realistically can achieve. If you put the effort to verify all software you run, you can miss, e.g., the threat of Spectre and Meltdown vulnerabilities and it’s game over™. So try to use your resources carefully, which is why threat modeling is important.
https://forum.qubes-os.org/t/intel-me-real-threat-for-ordinary-persons/7693