You will need some of these:
http://www.parallelminer.com/product/rev2-ultimate-2400watt-power-supply-kit-for-gpu-mining-94-platinum-efficiency-200v240v-w-32pcie-plugs/

As for networking you can build a few Rasberry Pi, they have a how to a few pages back by Philip. Canaan site state 20 miners per controller but I would do 8 per controller, it would be 2 daisy chains per usb port. Network is fairly simple doesn't require much to setup. Good luck on getting the 60 Avalon' s it's been quiet from Canaan lately.