Thank you for your comments.
I just find out after days of research that the iMac24 monitor do not calibrate properly and Apple wont do a thing about it. If you want total control you will have to buy an Apple cinema monitor conect it to the iMac and calibrate the cinema display but the iMac screen wont take proper calibration. To properly calibrate you have to bring the adjustment to 150 and the iMac screen won't go down that far. I got this from a good friend that make a living doing graphic work and is a Mac man since 1985. He bought one and had to connect a cinema screen to be able to calibrate, as we all know monitor calibration is critical for both photography and graphics work.
Therefore I desided to stick with Window and ordered a Dell SXP420 with a 24" Ultrasharp monitor, 4gig of Ram, 1Tbite of HD in Raid configuration, 512 Nvidia video card and 2- LaCie 500 EHD for backup. A similar setup on Mac would have cost me about $500.00 to $1,000.00 more. I also got 2 years in home service something that Apple do not provide and if they do it will cost an arm and a leg.
Thank you very much for all your help.