Roger,
While iBoot are good, they're expensive for what you get.
With iBoot, you are paying for some nice intelligence such as pinging the host its supplying power to. If it doesn't respond, it power cycles the system. Of course, this doesn't work if you have hosts communicating via 802.11 wireless LAN. To counteract this with a wireless set up, configuring watchdogs on the system is the answer - can elaborate more if needed.
Anyway, you may wish to try Interworld Electronics in Melbourne. Quality products and service. Their industrial switched power distribution products are fanless, perfect for long operating hours in dusty environments. I know you probably think your observatory is clean, but you'll be surprised by the amount of dust and gunk that enters with time. For a robust set up, go fanless with as many devices as you can.
You can check them out here -
http://www.ieci.com.au/products/prod...r-Distribution
Note, that they are not IP based, but serial. If your core requirement is an IP based solution, you can pick up a Wireless serial converter -
http://www.ieci.com.au/products/prod...Device-Servers