UKHELI.COM T-REX 600n
What you get and what you will need !!
How do they get it all in?
Cool Canopy !!

OS 50 Hyper and muffler

You will then need to buy a Gyro, I went for the GY 502 with S9254 high speed servo,

I will use the Align 6 amp BEC and 1900mah Li-Po, below is the 5.1 step down unit
That will be needed if like me you use the S9254 tail servo

Digital servos and a good Rx, this one is the Futaba 149 PCM

600mm blades should about finish the shopping list if you already have a heli Tx !!