I'm with Fred on his suggestion for a FITPC. I have two FITPC2 headless systems I purchased back in 2009 and they are both still running flawlessly today. The only maintenace that I needed to perform was replace the CMOS battery once as the system clock would reset upon reboot. They are powered on 24x7 controlling mount, cameras, focusers, etc. I made the transition to an SSD drive for the units in 2012 which has made the unit cooler (and faster). It runs SkyX, MaximDL, FocusMax, ACP w/Scheduler and more without a glitch on Windows 7 (32bit). You don't need grunt to run telescope and imaging control apps. I wouldn't dare attempt to process or calibrate images on this system. Its solely used for data acquisition and does that exceptionally well. When they do eventually die, I will certainly be going the FITPC route again. If you buy one, make sure you get the headless dongle that plugs into the HDMI port so you can run at full screen resolution via teamviewer, radmin or VNC. When you've got a lot of apps running doing different things its nice to see them all on one screen. Product rundown here -
http://fit-pc.com/download/General/f...e-overview.pdf
Ultimately any industrialised fanless pc will do the trick. FITPC2 will run 5W under normal load, 8W under high load so is power efficient.