I agree with the previous posters. N5C for sure
Airframe - N5C
Blades - 606mains 96-106tails (I run 106mm tails because I do a lot of hard aileron maneuvers but 96 is perfect too)
Motor - OS55HZ or HZR, either works well in this heli. I recommend HZR for a new nitro pilot though
Pipe - Hatori (with the os55, I have actually had much better power running the hatori made for the ys60)
Servos - use a plastic case servo with 150oz +. plastic will keep the heli light.
RX pack - 2200-2500ma pack is plenty, and keeps the heli light. I run a 1800 when I really want it very light. just don't get many flights on it.
FBL - the NEO and CGY both work great on this heli and have great gov. I lean towards the NEO, only preference, no real reason.
Head Speeds - IU1-1950, IU2-2150 some guys like 2250 as well.
Fuel - ok, I will have some guys bounce back at me about this, but, it has been my experience that the os55 is easier to tune, AND makes more power with the rotor rage 22.5% vs the 30%. it may very well be my flight style, or the different pipe, or how I have my gov setup, I don't know. all I know is the heli flys better with 22.5%, AND its cheaper!
on my N5C, I am running 14* collective pitch, and 11.5* cyclic pitch in the neo and it pulls and pulls and pulls. a nitro is the absolute best way to better your collective management and overall flight skills IMO. there is a natural feel to a nitro that cannot be emulated by most electrics. it has to do with the combustion engine and the torque it produces at the bottom end (around center). you will fly that N5C for about 2 months, then you will be ordering an N7, TRUST ME....
the wife turned the camera sideways after she started recording, so you have to turn your head to really watch it well. LOL. she also lost it for about 10 seconds, once she finds it back though, its a decent video. not an entire flight, but you will get an idea of the power it has. the presents in the air is also not small, believe me, it flys and looks larger than it really is.
https://youtu.be/nPwoQEM7FDQ