If you are okay with ddr4 setup, I'd suggest ryzen 3600 and b450 ds3h, you can get it around 15-16k new for mobo and cpu, and good 3600mhz ddr4 ram which will cost much less than ddr5, rx 6600 or 6700 gpu cause amd gpus are always best for linux (maybe get rx 580 if dont want to spend much on...