I just got a 21.5 iMac. It is my first mac and I love everything except the eyestrain and headache. I have been searching the internet, reading posts and am trying to decide between the anti glare film (Rhotodon or Radtech) or a privacy screen protector (3M or Viewsonic). Does anyone have recommendations? Most of the information I find on the film is from a couple years ago. Thanks in advance for your help!