I finally get around to updating the PC my wife and daughter use in the office this week. After a lot of deliberation I picked up a cheap (�125) bundle of motherboard/fan/Athlon 2100+ from Maplin Electronics along with a Lian-Li PC-60 aluminum case.
I'm really impressed by the case, it has 4 built in fans but I've only needed to connect two of them to keep the temperature stable. The fans are thermostatically controlled and it means the PC is almost silent. To put this into perspective the fan on the graphics card in the PC I work on is louder than the entire system, and I've had to press the eject button on the cd-drive to see if the system is even powered up.