[BrianBSL]

We used to use the Molex connectors from Digikey, but last order I got the no-name Jameco ones. I prefer the Jameco ones as the pins are the correct length and not too long like the Molex ones. The Jameco pins/sockets are a bit more expensive (as the only option is gold plated) than the tin plated Molex pins/sockets, but the Jameco housings are cheaper.

We've always used 2 or 3-conductor 22ga Belden wire from Jameco (not twisted pair nor ribbon cable). A 100ft spool goes for $15 or so IIRC. There should be no noise issues as neither the 5V(Digital/analog)/7.2V(PWM) or GND have any AC component to them.

I suggest you do get the write crimper, as its less than $50 (and there's a cheaper one with fewer sizes for less than $20 IIRC), either way not too bad (compared to a $150 Anderson crimper). Crimping these with pliers won't create a reliable connection and soldering can cause issues with mechanical hard points.