Acer Aspire Revo R3610 Desktop PC
Got to stay I'm suprised this was missed from the review list.
A revo has been reviewed before, but no dual core ones.
The specs are below, and a well know online retailer sells it for £240 (with Win 7) or £189 with Linux, so considerably cheaper than the Viewsonic.
Intel Atom Dual Core 330
NVIDIA Ion Chipset
2GB DDR2 800MHz
Configuration: 2 x 1GB
Expandable to 4GB
2 x soDIMM slot
NVIDIA Ion - GeForce 9400 - up to 896MB
High Definition Audio Support
LAN: Gigabit Ethernet, Wake-on-LAN ready
WLAN: 802.11 b/g