Wire sizes are determined by the current flowing through it..
For Battery, ESC and Motor wires, I usually use 14 AWG (approx. 2mm squared copper size)..
http://www.hobbyking.com/hobbyking/s..._1mtr_RED.html
For LEDs, they draw <50 mA, I use Electronics hook up wire like this
http://www.jaycar.com.au/productView...SUBCATID=995#1
OR this
http://www.jaycar.com.au/productView...SUBCATID=994#1
For screw Hoist motors, it really depends on the size of the motor.. If you wanted to be safe, use the same 14 AWG that you would for your drive motor..
Just be aware that the Turnigy Silicone wire sold by Hobbyking is a High Quality, super flexible wire that is well suited to the Vibrations found in an RC vehicle..
Also be aware that the size of the wire sold for Automotive use includes the size of the outer sheath as well, not just the copper conductors..
Cheers
PS. AWG = American Wire Gauge