Low level programming C

Could be pretty much any computer

rust

Need a lot of memory (8-16 GB) if you are planning on dissecting any existing projects

Machine Learning programming with Python

Start with colab / huggingface and get a feel for what level of hardware you need for the stuff you’re doing before you start buying stuff

If you want just a general high quality system with upgradability etc, frame.work or System76 are supposed to be good high end providers.