A very nice build but why do you need to build your own router? What is wrong with buying a standard off the shelf router and saving a lot of money and electricity?
Well as CA_Steve mentionned, it is a lot more flexible. Untangle has an built-in Anti-Virus, Anti-Spyware, Phishing protection, Anti-Spam, Attack blocker, Firewall, QoS, packet filter, DHCP server, DNS server, Web filter, Ad-blocker, bypass rules, NAT and a protocol control software. It also comes with an OpenVPN module that can work has client or server mode. I use it as a server. It's a very good out of the box solution.
And since it is based on debian, I've got a Terminal, I can SSH nto the box and intall what ever I want that isn't included with Untangle. But since I am not that much experienced with unix systems, I am not there yet.
This doesn't mean that I shouldn't use any of those software on my computers, but they can help reduce the amount of Internet junk that could get into my devices.
It is also easy with the ISK 100 to mount the router to a wall, since I simply screw the VESA rack first, then I put the ISK 110 on it. I don't have to mess around to allign the mounting holes of my 30$ router to fit my screws into the wall.
@CA_Steve: During bootup, I would get a peak load of 27.2W. Once the system is started, it idles between 14,8 & 16 watts.
I used a Belkin Conserve Insight to get the power comsumption.