Antec ISK300 iTX Small Form Factor Computer Case
One of the best small form factor (under 8 litres) you'll find, as this has 2 80mm fans for cooling while all others at this size use noisy 40mm fans. Can pack in a iTX motherboard, slim optical drive, two 2.5" hard drives, two 80mm fans and even a low profile PCIe expansion card. It does not have a power supply anymore (was only 65W and inefficient), so a PicoPSU will be needed. That would allow you to fit most recent CPU chips with integrated graphics in there with a low profile CPU Cooler (t