I just bought to my wife a Acer Aspire One for 250 Euros. It is better quality than the ASUS, sleek design, polished finishing, better keyboard, and support 2 SDHD cards, one will work as extension for the 8G internal memory (I installed a 16G SDHD so the total memory is 22G).
It boots very fast (5 to 6 seconds), comes loaded with SW and has a bright screen. The OS is Linux, and with a neat user interface.
I might by one for me ;-)

see http://www.acer.com/aspireone/