Im looking for a plain black case without RGB lighting, which is both cool and very quiet with either 3 or 4 front USB ports.
Any recommendations would be welcome. Thanks
To have 3 or 4 USB front ports maybe it is not a principal criterion to guide when you choose a case. This problem can be solved fine with an USB hub. This way, your exterior cable management will be slightely better, in my oppinion. Maybe to have an USB 3.1 GEN 2 port is a more important thing.
If you will reconsider your vision about the criteria to guide, Phanteks Eclipse P600S Dark version wich is a very good case, silent, and with a very good airflow in Mesh front pannel mode, will be a good option for you. http://www.phanteks.com/Eclipse-P600s.html
Do you need really a 4 USB front ports ? This way, your choises are a little limited, you can miss some really good and silent cases, wich have not 4 USB front ports.