I am sure this topic is discussed over and over again, I am sorry for that. I am not a real techy person, so I'm reaching out to you all for some thoughts. I have a 2008 Mac Pro, and run Photoshop CC and Lightroom. I don't do any video editing. I shoot with a Canon 5D. I am inpatient and hate waiting for functions to complete. Color calibration is important for photography production. Would the new IMac I7 4.0 Ghz be a better bet than a Mac Pro Quad or 6 core? Do any of you have experience on Retina Display's? I am sure they are pretty to look at, but what I really care about is editing and printing, and speed. Does photoshop even utilize 6 core, or would that be over kill? Thanks for you help.