Hey there Joe,
Question from the outside.... does it have to be a Helicopter?
I ask because the new Quadcopters out have many times more the lifting power, as well as the ease of construction, and SUPER SIMPLE flying, and DUREABLE construction.
You cant flip a helicopter over under power, and NOT cause damage. Quad's take abuse MUCH more effortlessly.
Quads are simpler to build, cheaper, and are inherently stable, whereas Helis are the opposite all three points.
Plus, quads are HIGH TECH, new school stuff, not a collection of nuts and bolts designed to vibrate itself to death.
Check out the GAUI 330X quadcopter, I have one and its awesome.