System requirements for dev machine

Hi,

we would like to get started with S/4HANA and therefore we would like to buy a dev machine. What is the requirement (doesn't need to be certified) for a S/4HANA system for the start? Where did you buy your system?

I already know the tools like https://apps.support.sap.com/sap/bc/bsp/sap/qs_oberflaeche/hana.do?sap-language=en&bsp-language=en

but I would like to know some real world system configuration. Looking forward to see some configurations.

Regards, Vanessa