The mCPX is about 9 inches in length with about the same rotor length, 9 inches.

It truely is a great heli for someone wanting to really learn how to fly a "real" rc hobby grade heli.  Dont let its small size fool you.

While it cant really do "3-D".  It is very aerobatic and can do some "slight" 3-D manuevers.

If you want one a tad smaller...Blade now has a Nano CPX which is basically a slightly smaller mCPX.  It supposedly is more a true 3-D heli...but I cant attest to that as Im not a 3D pilot.  I have flown one and it flies pretty much just like the mCPX, except I think that it is a little more "squirely".  Which should be given the fact that it is an even smaller heli with the same, if not more power to weight ratio.

Either one would be a good heli for you.  BUT, you should also invest in a SIM because flying a CP heli does have a steep learning curve.  If you have never flown one...you will be in for a surprise, for sure.

Once you can fly the Nano or mCPX...there really wont be a heli out there that you cant fly.  Learning 3-D is another story...but lifting off, flying around in circles or figure 8's or doing stall turns, etc (even inverted flight) is all possible on it, just as it is with larger helis.  Plus, you can fly either heli in the wind, which makes it great compared to any FP or coaxial heli that you cant fly in even the slightest of breezes without losing control.