At 171 grams the motor is a bit on the heavy side haven't really seen people use a motor that heavy after researching motors. And using 4's is not as common, that should be a rocket ship! The recommended motor here weighs 134 grams http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXAAGX
I decided to go the powerful option with a faster motor bit more than 1100 and bit less than 1250 that some people use. The weight of the motor is 141grams. http://www.hobbyking.com/hobbyking/s...dProduct=18120
For now not certain but a 11x5.5 or a 11x7 prop should be good.