Cases to look for,
On the Expensive side, sort of speak, as its much cheaper than the alternatives are the Norco cases, the 4224
are legendary rack cases in the server communities, the price is warranted by having a real server case with hotwswaping bays, not the best in terms of ventilation and noise, but none the less, products to consider for its factor and offering.
Below $200, i would consider a standard case, like Fractal Design Define R5
, that should allow you very easy cable management, semi quiet hdd operation with its grommet hdd trays (ideal would be to suspend them), still a very nice case with decent ventilation, you can add fans so your hdds have direct cooling.
Other server cases to consider,ARK 4U-500-CARosewill RSV-L4000CHENBRO SR10769-COCHENBRO SR20969-CO
Another thing to consider is if you like the smaller factor cases, you can check SPCR SilverStone DS380 8-Bay Server/NAS Chassis
, there are some nice mini itx server grade motherboards with the new atoms that might be good for transcoding (crosscheck if it has enough power to sustain the streams you want), here some motherboards SUPERMICRO MBD-A1SRi-2758F-O Mini ITX Server Motherboard DDR3 1600/1333
(8 core)ASRock C2750D4I Mini ITX Server Motherboard FCBGA1283 DDR3 1600/1333
(8 core + 10 sata ports)
Now if you are into modding, take a look into a SPCR member build, Time for a new Elysium Beast: V4.0