what kind of visualization
On which end? At the Arduino end, a LCD can display text, like part number and number of parts to make.
On the PC end, your imagination is the limit.
what type of network
I think you mean what kind of radios to create a network. That depends on whether any two Arduinos need to share data, or whether the data is only Arduino to PC to Arduino.
If the Arduinos are completely independent, Series 1 XBees offer the range that you have in mind and are easy to use with the Arduino. I like the XBee shield from Sparkfun, rather than the one from Arduino. Being able to use either the hardware serial port or a software serial port to talk to the XBee is an advantage over being forced to use the hardware serial port.