USe that motor as long as it's a Horizontal shaft for a good go-cart for yourself. Stick to RTR's or KIT's due to your experiance. When you increase size you decrease the speed it has to go to kill someone. Due to the size of the Servo's needed alone you could use the money to buy a 1:10 or 1:8 scale RTR.

Stick with the basics till you get some actual time under your belt.

Also watch the language. I know it gets censored but still the thaught counts.