I made the plunge and bought a Pixhawk Flight Controller, GPS, Compass and a 3DR Radio set all from 3DRobotics.com. Keep in mind, I just started in the RC world in December of last year (2013). I have 2 DJI Phantoms and now 2 DJI Flame Wheel F550's. One with a NAZA and one with the PixHawk. Here...