Justin Jee http://www.justinjee.com love Gaui x5 overpowered (stock) little rocket. It is a 30sized machine (500mm blate) but the excess power makes it look more like a 450 machine. 
Spec:
Heli: Gaui X5
Rotors: Gaui 500mm
Motor: Gaui/Scorpion 910kv/1820w motor
ESC: Castle ICE 75, BEC
Radio: Hitec Aurora 9 / Optima 6
Cyclic: Hitec HS5996TG
Gyro: LogicTech 6100T
Battery: TP 6s3800 45C
Source: Benny Chi
http://www.youtube.com/watch?v=8Q-7xQ6PXyE
this is the man !!!!