Accurate Calibration - is it possible?

I'm a graphic designer who recently switched from an "old fashioned" tube display monitor to a flat screen display iMac (I'm not sure what year the iMac is though). I'm getting frustrated with the new screen for a few reasons. My old screen displayed color that matched the pantone colors and cmyk mixes pretty accurately to how it would be printed at a professional printing company. The new flat screen on the iMac does not. Also, the colors change depending on how the screen is tilted ... so if the screen gets bumped the color is off. Also, let's say I have Pantone 72 at the top of the page and at the bottom of the same page. The same color looks lighter if it's closer to the bottom of the display. I can't judge tints or transparancies well anymore in relationship to colors around it. I've tried playing with the display settings in System Preferences, but I don't know what profile to use or how to figure out the numbers I need to make my own profile. Does anyone else know what I mean? Does anyone know how to fix my problem. I'd rather not go back to a tube display because I know they're becoming obsolete, but I need to know how to calibrate my screen to show accurate colors.
iMac   Mac OS X (10.4.6)  

I read the article (thank you for the link). I have OSX 10.4.6 and I have Tiger. So, now I'm even more confused why the color isn't consistent and why it doesn't display accurately. Another designer at my work has the same problem with her iMac screen. The colors are accurate when they print ... I need them to be displayed accurately while I'm designing so I can see if the color tint behind text is really going to be light enough to read the type on top of it or if the blue tint I used is really dark enough next to the other blue tint. I'm used to being able to judge how light and dark to make colors and transparencies by looking at it on screen while sliding the tint value bar and viewing it "live" so to speak as I build and tweak things. When I do that now it doesn't turn out right and I'm never sure which angle to tilt my screen because each way shows the colors differently.
I'm not real familiar with the ColorSync Utility ... is that where you go to customize a calibration setting? I wasn't sure which numbers to put in. Last night I view what my old monitors settings were ... do you think it would help to plug those in?

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