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Look at HFX chassis if you want a completely silent machine.
Has anyone considered the eeePCs as alternative?
The MythTV guys have been using MacMini's for slim clients.
According to THG tests (http://tinyurl.com/69aczv) the newest AMD Athlon 64 2000+ is much better then Intel Atom 230:
Hmmm.... well I would not recommend a Celeron @ 1 Ghz at all. Also it seems very bad value for money at 159 UKP!!!
This Gigabyte ATOM board looks to almost fit your spec; http://www.gigabyte.com.tw/Products/Motherboard/Products_Spec.aspx?ClassValue=Motherboard&ProductID=2850&ProductName=GA-GC230D(Atom)
But you'd have to remove the small processor fan and replace it with a heat-pipe cooler