Hi all. I'm really digging my new iMac 21.5". In fact, I'm thinking of upgrading to the 27" model. What is the ideal distance from the screen to the eyes? I also use it to watch movies, many of which are Bluray's in full 1080p. How will they look on the 27" model with the higher resolution of 2560x1440? I'm asking because my 46" HDTV supports "full 1080p", which means what for its resolution, 1920x1080? I've always wanted to know how monitors and TV screens differ. Is there a TV tuner that you can recommend for the iMac? I have Apple TV, but that's obviously not a tuner... Thanks for any advice!