We had a dilemma at work last week. We were joining the London INternet eXchange, and had to find some suitable BGP routers to install in their racks, but since power is somewhat limited in London data centres at the moment, we had to find something that used less than 150W of power draw.
The solution? A pair of Mac Minis running Ubuntu and Quagga with two 24 port HP gigabit switches.