Checkout TonidoPlug2 (http://www.tonidoplug.com/tonido_plug.html). It has 512 MB DDR3 RAM, Gigabit Ethernet, WiFi b/g/n and in-built enclosure for SATA II HDD. You can boot it directly from the SATA instead of internal flash. All the right things you need in a personal server. Also it runs debian squeeze.