Bought myself a new ACER ASPIRE REVO R3610 theatre/nettop pc from eBay for £100 to be my new home theatre box to sit next to my TV!
Windows 7 Premium (Licence XBMC installed)
1.6ghz Atom CPU
Wireless keyboard and mouse
It has loads of connectivity including 4 rear USB, WiFi, eSATA, SD card reader, and built in ethernet, VGA and HDMI out (useful for output to a 1080p TV which it supports full speed playback of video on!)
Should be able to play all my digital media nicely! (I have a 1TB USB3 drive all ready and waiting to hook up to it), it comes with a vesa plate as well to mount it on the back of my TV!
Currently it runs OpenElec on XMBC which is the Linux Media center software of choice for many, with low resource usage and a good and fast interface.