Wiring CNC xPRO v2 and high torque motors

My electronics skills are rather rusty these days. I wanted to get recommendations for the gauge wire I need to use to extend the connection from the nema23 high torgue motors used with the c-beam machine xlarge and the CNC xpro v2.

I can't forse needing to make these connections longer than 3 to 4 feet to get everything to where I want it.

Also is using a atx power supply to power the xpro v2 and the 4 nema 23 high torque motors on this machine