I usually recommend pcpartpicker.com to pick out the parts themselves. I’ve used it to build a few computers, and it makes it very easy to decide what you want.

As for Linux compatibility, many things should work right out of the box. I would agree with the other person that mentioned the motherboard being the main thing to watch for. Other than that, Nvidia GPUs would be the only thing I would avoid, just because they don’t have drivers directly in the Linux kernel yet. You can install them yourself or use a distro that has them already built in, but it’s just one more thing you might need to work through.

How does this involve Linux?