407 looks OK but just doesn't sound right with a centrifugal compressor, plus you couldn't get away with a narrow hangar.
Get the expandable blade bolt option and a blade folding kit and it works with a narrow hangar.
My choices:
Economy turbine: Enstrom 480B
Single turbine: Bell 407 or Agusta 119
Twin turbine: Bell 429 or Agusta 109 Grand New
Military: Huey Cobra
Pistons: why bother if we are dreaming! Dream big!