I am comfortable with building a power supply, but I already have to drag enough crap to the track. So I am going with Maxamps power supply, due to it size, weight, and power.

I also just ordered the super duo. This way if I decide to get silly and start running 6S like all the kool kids, I don't have to buy more equipment.

Taking to boy to the track is a blast. Now if I could him to do his own maintenance.