You need a calibrator like the Spyder from Datacolor or Huey from Pantone.
These are devices you stick on your screen that let the computer know what color it is showing vs what it thinks it is showing. It creates a new custom color profile for your display.
I have a D2. I use it on my CCFL IPS desktops. It is great. It has historically given me terrible LED results. Unusable actually. Over does the red to make up for all that green. I have a Spyder 3 that does a terrible job on LED as well (Glossy and Matte). I have not tried the new kit personally as I stopped caring about color on my Macbook glossy screen. I have to think they have improved. The specs say they have.
OP: Apples default profile is really quite good and pretty close to what you would want in a profile. If you need absolute accuracy then buy a Colorimeter.
On my Samsung rMBP the default profile was decent, may even call it good. On my late 2011 AG MBP the default profile was horrible.
I would never use or recommend a i1d2 (or any other colorimeter other than a i1d3) again.
The reason being is that they are not sealed. And WILL drift out of spec, even far out of spec. Any calibration done with a i1d2/Spyder/Huey, I do not trust as accurate. One thing to remember is you start counting how old the meter is, from when it was made, not when you opened the box.
Most of the time one doesn't even know the meter has drifted. The end user is trusting the meter/software, but in reality the profile is off.