Hi all - still exploring my new iMac and have two more questions: 1. I realized that when I start the webcam, my face is really grainy. By grainy, I am talking about ISO 1600 or above on a standard Canon DSLR. My guess is that this is due to where I place the iMac (backlit). And that the lack of light leads to such high ISO? 2. I have iPhoto and iMovie and Garageband all preinstalled on the system. But I see that they are also selling the programs on the app store for about 15 bucks each. Are they different? Or just for those with older iMacs without these programs installed? 3. This one is going to cause a little more controversy, but what's your default photo editting program? Aperture or Lightroom or CS?