You could use the 3 in 1 that comes with the CP. The 3 in 1 is just sticky taped to the E-flite reciever. If you want to go brushless, then its better to get an SR 2 in 1, gyro, brushless motor, and direct drive tail motor upgrade. The Hitec Neon 6 is about the same size as the E-flite reciever. The Futaba 146I is another. Or if you go 2.4, they are small as well.