BTW, the plugin for the 2CAN has not been released yet. When it is, you will be able to find it at FIRST Forge.
Another way to connect to CAN is to use the new Black Jaguar as a serial to CAN bridge. You just make the cable according the the getting started guide
from TI and plug it straight into the RS232 serial port on the cRIO. This way you don't need to buy a separate bridge device and can simply use one of your motor controllers. The driver plugin for using the Black Jaguar as a Serial to CAN bridge is posted on FIRST Forge.
If you are going to use a lot of motors in open loop mode, you may need the additional bandwidth of Ethernet.