My media computer uses an AMD Geode NX1750 cpu that I underclocked one step down from normal speed and it runs fanless now. 1gb of ram, 8gb compact flash card for the hard drive. I am also using a fanless video card. That computer is dead silent since I took the fans out of the 200W power supply that powers it. With no fans in an aluminum case it barely gets warm when using the dvb card to play hdtv feeds. The dvb card actually gets warmer than the rest of the computer combined. The video card is I think directx7 or 8 only. Doing normal stuff has no need for graphic accelerators so don't worry about the video card specs other than power consumption.
So find a good low powered setup and use a compact flash card for the drive, or a 4200rpm laptop drive if you want low power and silent running. If you are using it for browsing and email only configure the browser cache to not write to the drive and use compact flash. It uses a lot less power and is solid state so silent. Keep the flash under half full so wear leveling can keep it lasting a really long time.
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