Form factor "download station"

I currently have a server with 16 HDDs and a bunch of HTPCs at home. I am now thinking to add a "download station" to the line-up for my usenet downloads. In the past, I have been doing this with the server (running 24/7), but getting annoyed about the energy consumption and noise.

So, looking for a new built with the following requirement:

* Ideally no fans, no noise, no blinking lights

* Very nice form factor (ok to spend more on the case, but would love to see something nice)

* Still allows me to use the following "old" components that I currently have no use for
--- Asus Sabertooth Z77 ATX mobo with i7 and 6GB ram (also have a CPU fan, but wondering whether I can just not use it?)
--- SSD PCI-E harddisk (optional to be used, but would be nice)
--- Four 4TB harddisks (open only to use 1 or 2 (or even none) if case form factor does not allow the use of all 4)

Besides the case, I would still need to buy a PSU and an OS (will be Win7 or Win8 for sure). Any thoughts on the following questions:

1) Nicest form factor case that fits my "old" components?
2) Required PSU?
3) Possibility to run this set-up without any fans for 24/7?


Thanks in advance for any ideas you may have!!!