Corsair 800D, play around with the fans and cools really well.
Cosmos has silencing wise "externally" quite nice design but HDD cooling isn't really up to the job (mostly thanks to that very complex HDD cage system) and especially for clearly intake limited case internal airflow could use redirecting for getting air to places where it's most needed. (also minimal noise means less airflow to start with so better to use it efficiently)coolermaster cosmos pure or coolermaster cosmos atcs 840.
With spacious E-ATX full tower it's harder to have actually bad cooling... but that does in no way mean it's even close to optimal utilisation of airflow.People debate if it really is good for air cooling, but I think a few people have now proved it is good for both water and air.
800d