This is what I have on my HK 600
Hitec HS-422 servos X3
GY401 Gyro and S9254 servo
Motor Turnigy 600 4330-1100 KV with 17 tooth pinion (you will have to do the frame mod)
Turnigy UBEC 7.5 A running 5 v
Hobby Wing 100amp speed control with bec disconnected
5000 ma 6s 40c battery (motor only)
2200 ma 3s 30c battery (servos and RX)
I just sport fly maybe a few loops and a few flips.
Good enough for me.
Change the main gear and auto rotation, and also the tail drive gear.
It may not be the best stuff but thats all the money tree had on it.