Novak motors are very good motors. I recently switched from the LRP motors to the Novak motors and could tell a difference.

All of the brushless motors are either rated as a 13.5,17.5, etc. with exception of the mamba motors which are rated by KV.

I would probobly stick with a Novak, LRP, Orion or another top brand when choosing a motor.

Also make sure you have a good brushless/brushed ESC. I would recommend the LRP Sphere series. It is really easy to use and they are Lipo compatible.