i use a rather perment standing Gateway 2000 Tower case i got at a local bulk place for $5.
It's 22.5" tall, 17" deep, and 10" wide.
it has mounts for 2 fans in the lower front, 2 more mounts for fans infront of the large 3.5" bay rack by the floppy drive, has 4 bays there. it has a mount for a fan out on the back side of the case just between the power supply and the motherboard, and another fan mount up top of the power supply. Another 4 bay rack for 3.5" devices is above the power supply in this case, as well as 4 bays for 5.25" devices just above the floppy.
it's my dream some day to have a dual p4 network server (do they even have dual p4 mobos yet ?) and run full scsi devices in all racks, 40gb 10k rpm each and raid0 em.
But just for now i use it for my amd gaming rig, when i win the lottery i'll buy the dual p4
oh and yes it stays very cool, i have a fan mounted in every avaible slot, all in front blow air in, all in back exaust it out.
"And he said, "Let There Be Light"" -God