Are you buying this for just bashing or will you be racing? If racing, both motors are a lot for e-buggy. Also, you want sensored for racing, so that throws out the Castle setup.

I would recommend the following 4s setup:

ESC: http://www.falconsekido.com/products...c-for-1-10-car

Motor: http://www.hobbyking.com/hobbyking/s...or_1900KV.html

Half the price of a the Castle or Tekin setup and just as good.