Jammin X-1 CRT motor selection

Yes, I read the sticky. I am familiar with lipos, KV, stuff like that from elecric planes and helis. I am not looking for a motor to run 4s AND 6s, I was just saying in the future, I'd like to do 6s ON THE MONSTER MAX ESC AND MOTOR.

I just want an inexpensive motor that will give me close to the speed and runtimes I want on 4s with the Mamba max controller. Is it the 6XL, 7XL or 8XL?