Built another computer... Just finished a 24 hour burn in using Prime95.
-Antec Mini-P180 micro-ATX case; stock 200mm fan is mounted using rubber retainers, and is undervolted to 5V, bottom HDD cage is removed, exhaust fan is removed.
-Asus P5QPL-VM EPU micro-ATX motherboard with eFan control. The case fan (Enermax Twister) is controlled by the eFan, as the HSF is passive.
-Intel Core2Duo E6750 overclocked via Asus TurboKey with Scythe Orochi passive heatsink.
-PNY GeForce GTX260 216 - BIOS modified to under-run the fan at 25%
-SeaSonic M12-II Modular Silent 430W PSU on silicone standoffs, all cables routed.
-Dual Samsung F1 Spinpoint 750GB SATA drives on silicone standoffs.
DVD-RW is a dual layer external Samsung unit, inside of an insulted case. The computer is running Win7 64-bit, with a 3Dmark06 score of 13982. This system also features Asus Express Gate, which allows you to turn the system on in 5 seconds, and use email, skype, chat, etc. similar to an Eee PC netbook.
Power supply is 80-Plus certified, EPU motherboard and CPU throttling are used, total system power use is less than 250W under load with 90+ efficiency.