If your set on the Slow Stick do yourself a favor and get the 400 rather than the 300. They are the same price but the 400 is a lot stronger motor.
http://www3.towerhobbies.com/cgi-bin...&I=LXHCJ2&P=SM
I would go with a 15A ESC. it will give you a better chance of not burning out, weighs about the same and will fit in a wider variety of planes in the future.