This is my Windows Home Server rig. I think it is now in pretty much a finished condition. Still room for a couple more HDD's when the need arises though.
Coolermaster Centurion 590 case
Gigabyte GA G31M-S2L
Intel E7200 with Ninja Mini
2x1GB Kingston RAM
SiI 3114 SATA controller
Assorted HDD's totalling 5.57TB
It was pretty much a budget build, just trying to get all of my HDD's out of my HTPC and localise all storage. The case is the cheapest I could find with 9 5.25" bays, and everything else is pretty low end. I had the ninja mini lying around and all the fans are spares too.
The case is pretty basic, but by soft mounting the drives in the 5.25" bays, controlling the airflow paths and turning the PSU so it sucks in from the bottom, it actually is pretty quiet.
I covered over all the side and top vents in the case, and the whole front panel acts as an intake over the HDD's with some foam for a filter. Exhaust is a Nexus 120mm at 7V and the Zalman 80mm on the Mini is turned right down with a Fanmate.
All drives are suspended with Stretch Magic, and are not too noisy, considering. The CPU is undervolted to 1.1V, I haven't really had time to get it much lower, but I will get around to it eventually.
Initially HDD's were running at around 20-25C above ambient temperature. I was thinking of installing 3 Scythe Kama Bay coolers to keep them cool, but at $30 each in Australia, couldn't really foot the bill. Instead I used three 120mm fans I had lying around (A nexus, Noctua S800, Scythe S-flex E) and strapped them to the front of the case with wire and a bit of foam tape to absorb vibration. All 3 are running at 7V, and are really quiet. Works great, temps dropped 10C across the board, now about 10-15 above ambient.
It was never going to be the quietest thing I have built, with all those HDD's, but it lives in a corner of the lounge room a fair way from where anyone sits, and can't be heard unless it is the middle of the night with everything else turned off. Been running now for about 4-5 months, and hopefully will go strong for a few years to come.