I have an old Atom ITX board that needs a case.
http://www.scan.co.uk/products/therm...h-220w-sfx-psu
Intended for a basic homework PC for my son running Libre Office under Linux. If it doesn't have the grunt for that then I could stretch to an AM1 solution, but I specifically don't want the machine able to play decent games
I make that case 9.5 litres, which seems about as small as I can get before I need exotic and expensive power supplies.