Thomas, I'm not sure I follow your question, the network part doesn't exactly make sense with USB.
With that said, I'd recommend any decent USB hub with external power (10W, not 1W) as the Pi can only supply a small amount. It is my understanding that it's enough to support a mouse and keyboard but not much else.
At the moment I'm working with a Pi and an Adafruit PWM board to drive 10 LEDs and a 3.3v RS232 chip. I have a 10W power USB supply attached to the Pi's micro-B connector. Later I intend to hook up a powered USB hub to hook up more IO.