Try an Asus EEE PC, they're lightweight, very small, able to run Windows comfortably, cheap and have all the bits and bobs (USB, external VGA output, sound card, SD card slot) You can setup wireless internet easily, if you're interested in wireless internet, please PM me. I'm an Exetel agent so I have a pretty good knowledge of wireless coverage in regional areas & I have access to Optus GMAP software so I can almost guarantee your coverage.
-Andrew