At the moment I’m using the Corsair Carbide series 330R Black. It’s super silent and comes with a baffle for the top so you can close the front door and put the baffle on the top if you’re using the PC without much load. (Say if you want to watch a film or you’re just browsing etc)
I’m also using the Corsair Hydro series H100i to cool the i7-5960X. It keeps it super cool for most things and it has three settings for fan speed. The only time I set it to Balanced is if I’m rendering in Keyshot and at full simulation the CPU doesn’t get much hotter than 48 deg c.
Standard GTX970 barely gets a look in to be fair.
When it’s idle the CPU tops out at around 35 deg C
So the system is pretty silent until I flick a switch but even on balanced mode with all the doors open it’s not that loud. When it’s on performance mode it’s like being in a server room but there is literally no difference in temperature reduction between balanced and performance.
I went for the Asus X99-E WS motherboard for stability.