Calibrating 24" IMac screen

Hi. I am just switching over from Windows to Mac so please be patient with this question. I am trying to calibrate my monitor using spyder 2 pro. In the setup I have t choose between brightness, contrast, or backlight. problem 1. Next I have to chose color sliders or Kelvin preset sliders. I don't want to be too much of an idiot but I can't find this info. All I see is the one F1/F2 control.
In my digging today I did see where the monitor can be set for all color spaces from a pull down list. Are these monitors that good that they never need recalibrated...do I just pick the space and throw away my Spyder?
Oh, and I tried the 'advanced' by eye option of color calibrating, making the apple match the background, and would prefer a more effective way. My eyes started playing tricks on me.
Thanks.

Hi, I just calibrate mine for the first time with Spyder 3 Pro so I know a little:
It's better if you start all over again, in case the preferences are set wrong:
1. Click in Go and select Display, you have to choose that you own an LCD screen.
2. Select that brightness (F1 and F2) Note: I set my brightness just on the 5th bar from the left to the right
3. Then after you select it, Spyder should give you some values like Gamma and White Point, I've them as Gamma 2.2 and White Point 6500 K. If the results you have are different, try changing them choosing the option "change this settings"
3a. if you are changing the settings in the target window you could to choose 2.2-6500 or the target you want.
4. Once you are agree with the targets you have to click next and set gray balance calibration "on"
5. on the next screen is ask to choose if you want the ambient light compensation on or off. I choose off, because every time I choose on I had a problem with the luminosity, because the iMac screens have this luminosity problem and they reflect so much light, therefore either you choose off and thats it or you choose on.
5a. if you choose on, you have to control the environment light, e.g. close your binds or turn off the light, etc. Do this until you get a "Moderately Low" value, which is the best value for editing pictures.
6. the next steps are easy, just follow the on-screen steps and voilà!!
Note: do not change the icc settings (preferences>advance settings) leave the value in 2.0 because the iMac wont recognize the 4.0 icc file.

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