I do allot of digital art, and while I've been considering an iMac I'm worried about the saturation on the glossy screen. Will the glossy screen really make that big of a difference? Does it have an extra HDMI port by chance? I have a 22" matte display that I currently use. Is it easy to upgrade the ram/HD on an iMac? And finally should I buy now or is there an update on the horizon? Thanks!