What are the smallest tower cases for ATX? I know everyone is buying the mini ITX/micro ATX boards, but I already have the mainboard/CPU/HSF and want a case that is smaller than the typical 9/10 bay mid tower. It will have an optical drive, a removable 3.5" dual bay, and only two internal 3.5" drives. Are there any good cases around 16" high that accept a standard PSU? Thanks.